UBSAN: undefined-behaviour in chkSuper
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syzbot
Sep 22, 2020, 12:30:19 AM9/22/20
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 015e94d0 Linux 4.19.146
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=11653365900000
kernel config: https://syzkaller.appspot.com/x/.config?x=243dd74ad58a8a57
dashboard link: https://syzkaller.appspot.com/bug?extid=93832818c5634b9e5cfa
compiler: gcc (GCC) 10.1.0-syz 20200507
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+938328...@syzkaller.appspotmail.com
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
================================================================================
UBSAN: Undefined behaviour in fs/jfs/jfs_mount.c:385:25
shift exponent 6156 is too large for 32-bit type 'int'
CPU: 0 PID: 20071 Comm: syz-executor.3 Not tainted 4.19.146-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x22c/0x33e lib/dump_stack.c:118
ubsan_epilogue+0xe/0x3a lib/ubsan.c:161
__ubsan_handle_shift_out_of_bounds.cold+0x1c4/0x250 lib/ubsan.c:422
chkSuper.cold+0x1e/0x98 fs/jfs/jfs_mount.c:385
jfs_mount+0x47/0x3d0 fs/jfs/jfs_mount.c:94
jfs_fill_super+0x55c/0xb50 fs/jfs/super.c:589
mount_bdev+0x2fc/0x3b0 fs/super.c:1158
mount_fs+0xa3/0x318 fs/super.c:1261
vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
vfs_kern_mount fs/namespace.c:951 [inline]
do_new_mount fs/namespace.c:2469 [inline]
do_mount+0x51c/0x2f10 fs/namespace.c:2799
ksys_mount+0xcf/0x130 fs/namespace.c:3015
__do_sys_mount fs/namespace.c:3029 [inline]
__se_sys_mount fs/namespace.c:3026 [inline]
__x64_sys_mount+0xba/0x150 fs/namespace.c:3026
do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x46004a
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 da 89 fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007f7998275a88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f7998275b20 RCX: 000000000046004a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f7998275ae0
RBP: 00007f7998275ae0 R08: 00007f7998275b20 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 0000000020000040 R15: 0000000020000140
================================================================================
================================================================================
UBSAN: Undefined behaviour in fs/jfs/jfs_imap.c:458:7
shift exponent -6144 is negative
CPU: 0 PID: 20071 Comm: syz-executor.3 Not tainted 4.19.146-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x22c/0x33e lib/dump_stack.c:118
ubsan_epilogue+0xe/0x3a lib/ubsan.c:161
__ubsan_handle_shift_out_of_bounds.cold+0x1c4/0x250 lib/ubsan.c:422
diReadSpecial.cold+0x1b/0x3e fs/jfs/jfs_imap.c:458
jfs_mount+0x83/0x3d0 fs/jfs/jfs_mount.c:98
jfs_fill_super+0x55c/0xb50 fs/jfs/super.c:589
mount_bdev+0x2fc/0x3b0 fs/super.c:1158
mount_fs+0xa3/0x318 fs/super.c:1261
vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
vfs_kern_mount fs/namespace.c:951 [inline]
do_new_mount fs/namespace.c:2469 [inline]
do_mount+0x51c/0x2f10 fs/namespace.c:2799
ksys_mount+0xcf/0x130 fs/namespace.c:3015
__do_sys_mount fs/namespace.c:3029 [inline]
__se_sys_mount fs/namespace.c:3026 [inline]
__x64_sys_mount+0xba/0x150 fs/namespace.c:3026
do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x46004a
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 da 89 fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007f7998275a88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f7998275b20 RCX: 000000000046004a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f7998275ae0
RBP: 00007f7998275ae0 R08: 00007f7998275b20 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 0000000020000040 R15: 0000000020000140
================================================================================
================================================================================
UBSAN: Undefined behaviour in fs/jfs/jfs_imap.c:126:7
shift exponent -6144 is negative
CPU: 0 PID: 20071 Comm: syz-executor.3 Not tainted 4.19.146-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x22c/0x33e lib/dump_stack.c:118
ubsan_epilogue+0xe/0x3a lib/ubsan.c:161
__ubsan_handle_shift_out_of_bounds.cold+0x1c4/0x250 lib/ubsan.c:422
diMount.cold+0x17/0x1c fs/jfs/jfs_imap.c:126
jfs_mount+0xbf/0x3d0 fs/jfs/jfs_mount.c:111
jfs_fill_super+0x55c/0xb50 fs/jfs/super.c:589
mount_bdev+0x2fc/0x3b0 fs/super.c:1158
mount_fs+0xa3/0x318 fs/super.c:1261
vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
vfs_kern_mount fs/namespace.c:951 [inline]
do_new_mount fs/namespace.c:2469 [inline]
do_mount+0x51c/0x2f10 fs/namespace.c:2799
ksys_mount+0xcf/0x130 fs/namespace.c:3015
__do_sys_mount fs/namespace.c:3029 [inline]
__se_sys_mount fs/namespace.c:3026 [inline]
__x64_sys_mount+0xba/0x150 fs/namespace.c:3026
do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x46004a
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 da 89 fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007f7998275a88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f7998275b20 RCX: 000000000046004a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f7998275ae0
RBP: 00007f7998275ae0 R08: 00007f7998275b20 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 0000000020000040 R15: 0000000020000140
================================================================================
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
buffer_io_error: 107 callbacks suppressed
Buffer I/O error on dev loop4p1, logical block 16256, async page read
Buffer I/O error on dev loop4p1, logical block 16257, async page read
Buffer I/O error on dev loop4p1, logical block 16258, async page read
Buffer I/O error on dev loop4p1, logical block 16259, async page read
Buffer I/O error on dev loop4p2, logical block 32512, async page read
Buffer I/O error on dev loop4p2, logical block 32513, async page read
Buffer I/O error on dev loop4p2, logical block 32514, async page read
Buffer I/O error on dev loop4p2, logical block 32515, async page read
Buffer I/O error on dev loop4p2, logical block 32516, async page read
Buffer I/O error on dev loop4p2, logical block 32517, async page read
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
print_req_error: 86 callbacks suppressed
print_req_error: I/O error, dev loop4, sector 32522
print_req_error: I/O error, dev loop4, sector 32537
print_req_error: I/O error, dev loop4, sector 32640
print_req_error: I/O error, dev loop4, sector 32522
print_req_error: I/O error, dev loop4, sector 32524
print_req_error: I/O error, dev loop4, sector 32526
print_req_error: I/O error, dev loop4, sector 32528
print_req_error: I/O error, dev loop4, sector 32537
print_req_error: I/O error, dev loop4, sector 32538
print_req_error: I/O error, dev loop4, sector 32539
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
buffer_io_error: 29 callbacks suppressed
Buffer I/O error on dev loop4p1, logical block 16256, async page read
Buffer I/O error on dev loop4p1, logical block 16257, async page read
Buffer I/O error on dev loop4p1, logical block 16258, async page read
Buffer I/O error on dev loop4p1, logical block 16259, async page read
sch_tbf: peakrate 240 is lower than or equals to rate 5340312393123682526 !
sch_tbf: peakrate 240 is lower than or equals to rate 5340312393123682526 !
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
Buffer I/O error on dev loop4p2, logical block 32512, async page read
Buffer I/O error on dev loop4p2, logical block 32513, async page read
Buffer I/O error on dev loop4p2, logical block 32514, async page read
Buffer I/O error on dev loop4p2, logical block 32515, async page read
Buffer I/O error on dev loop4p2, logical block 32516, async page read
Buffer I/O error on dev loop4p2, logical block 32517, async page read
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters.
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following issue on:
HEAD commit: 015e94d0 Linux 4.19.146
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=11653365900000
kernel config: https://syzkaller.appspot.com/x/.config?x=243dd74ad58a8a57
dashboard link: https://syzkaller.appspot.com/bug?extid=93832818c5634b9e5cfa
compiler: gcc (GCC) 10.1.0-syz 20200507
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+938328...@syzkaller.appspotmail.com
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
================================================================================
UBSAN: Undefined behaviour in fs/jfs/jfs_mount.c:385:25
shift exponent 6156 is too large for 32-bit type 'int'
CPU: 0 PID: 20071 Comm: syz-executor.3 Not tainted 4.19.146-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x22c/0x33e lib/dump_stack.c:118
ubsan_epilogue+0xe/0x3a lib/ubsan.c:161
__ubsan_handle_shift_out_of_bounds.cold+0x1c4/0x250 lib/ubsan.c:422
chkSuper.cold+0x1e/0x98 fs/jfs/jfs_mount.c:385
jfs_mount+0x47/0x3d0 fs/jfs/jfs_mount.c:94
jfs_fill_super+0x55c/0xb50 fs/jfs/super.c:589
mount_bdev+0x2fc/0x3b0 fs/super.c:1158
mount_fs+0xa3/0x318 fs/super.c:1261
vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
vfs_kern_mount fs/namespace.c:951 [inline]
do_new_mount fs/namespace.c:2469 [inline]
do_mount+0x51c/0x2f10 fs/namespace.c:2799
ksys_mount+0xcf/0x130 fs/namespace.c:3015
__do_sys_mount fs/namespace.c:3029 [inline]
__se_sys_mount fs/namespace.c:3026 [inline]
__x64_sys_mount+0xba/0x150 fs/namespace.c:3026
do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x46004a
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 da 89 fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007f7998275a88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f7998275b20 RCX: 000000000046004a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f7998275ae0
RBP: 00007f7998275ae0 R08: 00007f7998275b20 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 0000000020000040 R15: 0000000020000140
================================================================================
================================================================================
UBSAN: Undefined behaviour in fs/jfs/jfs_imap.c:458:7
shift exponent -6144 is negative
CPU: 0 PID: 20071 Comm: syz-executor.3 Not tainted 4.19.146-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x22c/0x33e lib/dump_stack.c:118
ubsan_epilogue+0xe/0x3a lib/ubsan.c:161
__ubsan_handle_shift_out_of_bounds.cold+0x1c4/0x250 lib/ubsan.c:422
diReadSpecial.cold+0x1b/0x3e fs/jfs/jfs_imap.c:458
jfs_mount+0x83/0x3d0 fs/jfs/jfs_mount.c:98
jfs_fill_super+0x55c/0xb50 fs/jfs/super.c:589
mount_bdev+0x2fc/0x3b0 fs/super.c:1158
mount_fs+0xa3/0x318 fs/super.c:1261
vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
vfs_kern_mount fs/namespace.c:951 [inline]
do_new_mount fs/namespace.c:2469 [inline]
do_mount+0x51c/0x2f10 fs/namespace.c:2799
ksys_mount+0xcf/0x130 fs/namespace.c:3015
__do_sys_mount fs/namespace.c:3029 [inline]
__se_sys_mount fs/namespace.c:3026 [inline]
__x64_sys_mount+0xba/0x150 fs/namespace.c:3026
do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x46004a
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 da 89 fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007f7998275a88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f7998275b20 RCX: 000000000046004a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f7998275ae0
RBP: 00007f7998275ae0 R08: 00007f7998275b20 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 0000000020000040 R15: 0000000020000140
================================================================================
================================================================================
UBSAN: Undefined behaviour in fs/jfs/jfs_imap.c:126:7
shift exponent -6144 is negative
CPU: 0 PID: 20071 Comm: syz-executor.3 Not tainted 4.19.146-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x22c/0x33e lib/dump_stack.c:118
ubsan_epilogue+0xe/0x3a lib/ubsan.c:161
__ubsan_handle_shift_out_of_bounds.cold+0x1c4/0x250 lib/ubsan.c:422
diMount.cold+0x17/0x1c fs/jfs/jfs_imap.c:126
jfs_mount+0xbf/0x3d0 fs/jfs/jfs_mount.c:111
jfs_fill_super+0x55c/0xb50 fs/jfs/super.c:589
mount_bdev+0x2fc/0x3b0 fs/super.c:1158
mount_fs+0xa3/0x318 fs/super.c:1261
vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
vfs_kern_mount fs/namespace.c:951 [inline]
do_new_mount fs/namespace.c:2469 [inline]
do_mount+0x51c/0x2f10 fs/namespace.c:2799
ksys_mount+0xcf/0x130 fs/namespace.c:3015
__do_sys_mount fs/namespace.c:3029 [inline]
__se_sys_mount fs/namespace.c:3026 [inline]
__x64_sys_mount+0xba/0x150 fs/namespace.c:3026
do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x46004a
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 da 89 fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007f7998275a88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f7998275b20 RCX: 000000000046004a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f7998275ae0
RBP: 00007f7998275ae0 R08: 00007f7998275b20 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 0000000020000040 R15: 0000000020000140
================================================================================
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
buffer_io_error: 107 callbacks suppressed
Buffer I/O error on dev loop4p1, logical block 16256, async page read
Buffer I/O error on dev loop4p1, logical block 16257, async page read
Buffer I/O error on dev loop4p1, logical block 16258, async page read
Buffer I/O error on dev loop4p1, logical block 16259, async page read
Buffer I/O error on dev loop4p2, logical block 32512, async page read
Buffer I/O error on dev loop4p2, logical block 32513, async page read
Buffer I/O error on dev loop4p2, logical block 32514, async page read
Buffer I/O error on dev loop4p2, logical block 32515, async page read
Buffer I/O error on dev loop4p2, logical block 32516, async page read
Buffer I/O error on dev loop4p2, logical block 32517, async page read
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
print_req_error: 86 callbacks suppressed
print_req_error: I/O error, dev loop4, sector 32522
print_req_error: I/O error, dev loop4, sector 32537
print_req_error: I/O error, dev loop4, sector 32640
print_req_error: I/O error, dev loop4, sector 32522
print_req_error: I/O error, dev loop4, sector 32524
print_req_error: I/O error, dev loop4, sector 32526
print_req_error: I/O error, dev loop4, sector 32528
print_req_error: I/O error, dev loop4, sector 32537
print_req_error: I/O error, dev loop4, sector 32538
print_req_error: I/O error, dev loop4, sector 32539
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
buffer_io_error: 29 callbacks suppressed
Buffer I/O error on dev loop4p1, logical block 16256, async page read
Buffer I/O error on dev loop4p1, logical block 16257, async page read
Buffer I/O error on dev loop4p1, logical block 16258, async page read
Buffer I/O error on dev loop4p1, logical block 16259, async page read
sch_tbf: peakrate 240 is lower than or equals to rate 5340312393123682526 !
sch_tbf: peakrate 240 is lower than or equals to rate 5340312393123682526 !
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
Buffer I/O error on dev loop4p2, logical block 32512, async page read
Buffer I/O error on dev loop4p2, logical block 32513, async page read
Buffer I/O error on dev loop4p2, logical block 32514, async page read
Buffer I/O error on dev loop4p2, logical block 32515, async page read
Buffer I/O error on dev loop4p2, logical block 32516, async page read
Buffer I/O error on dev loop4p2, logical block 32517, async page read
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters.
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
NILFS (loop1): error -22 while searching super root
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop1): broken superblock, retrying with spare superblock (blocksize = 4096)
NILFS (loop1): mounting unchecked fs
NILFS (loop1): invalid segment: Checksum error in segment payload
NILFS (loop1): unable to fall back to spare super block
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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syzbot
Sep 22, 2020, 12:41:15 AM9/22/20
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following issue on:
HEAD commit: 015e94d0 Linux 4.19.146
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=11609f07900000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1574a603900000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+938328...@syzkaller.appspotmail.com
audit: type=1400 audit(1600749551.596:8): avc: denied { execmem } for pid=6476 comm="syz-executor088" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd ad fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 da ad fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007ffdd8c8cc18 EFLAGS: 00000283 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffdd8c8cc70 RCX: 0000000000446d4a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffdd8c8cc30
RBP: 00007ffdd8c8cc30 R08: 00007ffdd8c8cc70 R09: 00007ffd00000015
R10: 0000000000000000 R11: 0000000000000283 R12: 0000000000000001
R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003
Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd ad fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 da ad fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007ffdd8c8cc18 EFLAGS: 00000283 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffdd8c8cc70 RCX: 0000000000446d4a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffdd8c8cc30
RBP: 00007ffdd8c8cc30 R08: 00007ffdd8c8cc70 R09: 00007ffd00000015
R10: 0000000000000000 R11: 0000000000000283 R12: 0000000000000001
R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003
Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd ad fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 da ad fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007ffdd8c8cc18 EFLAGS: 00000283 ORIG_RAX: 00000000000000a5
RAX: ff
HEAD commit: 015e94d0 Linux 4.19.146
git tree: linux-4.19.y
kernel config: https://syzkaller.appspot.com/x/.config?x=243dd74ad58a8a57
dashboard link: https://syzkaller.appspot.com/bug?extid=93832818c5634b9e5cfa
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15a44075900000
dashboard link: https://syzkaller.appspot.com/bug?extid=93832818c5634b9e5cfa
compiler: gcc (GCC) 10.1.0-syz 20200507
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1574a603900000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+938328...@syzkaller.appspotmail.com
================================================================================
UBSAN: Undefined behaviour in fs/jfs/jfs_mount.c:385:25
shift exponent 6156 is too large for 32-bit type 'int'
CPU: 1 PID: 6476 Comm: syz-executor088 Not tainted 4.19.146-syzkaller #0
UBSAN: Undefined behaviour in fs/jfs/jfs_mount.c:385:25
shift exponent 6156 is too large for 32-bit type 'int'
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x22c/0x33e lib/dump_stack.c:118
ubsan_epilogue+0xe/0x3a lib/ubsan.c:161
__ubsan_handle_shift_out_of_bounds.cold+0x1c4/0x250 lib/ubsan.c:422
chkSuper.cold+0x1e/0x98 fs/jfs/jfs_mount.c:385
jfs_mount+0x47/0x3d0 fs/jfs/jfs_mount.c:94
jfs_fill_super+0x55c/0xb50 fs/jfs/super.c:589
mount_bdev+0x2fc/0x3b0 fs/super.c:1158
mount_fs+0xa3/0x318 fs/super.c:1261
vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
vfs_kern_mount fs/namespace.c:951 [inline]
do_new_mount fs/namespace.c:2469 [inline]
do_mount+0x51c/0x2f10 fs/namespace.c:2799
ksys_mount+0xcf/0x130 fs/namespace.c:3015
__do_sys_mount fs/namespace.c:3029 [inline]
__se_sys_mount fs/namespace.c:3026 [inline]
__x64_sys_mount+0xba/0x150 fs/namespace.c:3026
do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x446d4a
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x22c/0x33e lib/dump_stack.c:118
ubsan_epilogue+0xe/0x3a lib/ubsan.c:161
__ubsan_handle_shift_out_of_bounds.cold+0x1c4/0x250 lib/ubsan.c:422
chkSuper.cold+0x1e/0x98 fs/jfs/jfs_mount.c:385
jfs_mount+0x47/0x3d0 fs/jfs/jfs_mount.c:94
jfs_fill_super+0x55c/0xb50 fs/jfs/super.c:589
mount_bdev+0x2fc/0x3b0 fs/super.c:1158
mount_fs+0xa3/0x318 fs/super.c:1261
vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
vfs_kern_mount fs/namespace.c:951 [inline]
do_new_mount fs/namespace.c:2469 [inline]
do_mount+0x51c/0x2f10 fs/namespace.c:2799
ksys_mount+0xcf/0x130 fs/namespace.c:3015
__do_sys_mount fs/namespace.c:3029 [inline]
__se_sys_mount fs/namespace.c:3026 [inline]
__x64_sys_mount+0xba/0x150 fs/namespace.c:3026
do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd ad fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 da ad fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007ffdd8c8cc18 EFLAGS: 00000283 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffdd8c8cc70 RCX: 0000000000446d4a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffdd8c8cc30
RBP: 00007ffdd8c8cc30 R08: 00007ffdd8c8cc70 R09: 00007ffd00000015
R10: 0000000000000000 R11: 0000000000000283 R12: 0000000000000001
R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003
================================================================================
================================================================================
UBSAN: Undefined behaviour in fs/jfs/jfs_imap.c:458:7
shift exponent -6144 is negative
CPU: 1 PID: 6476 Comm: syz-executor088 Not tainted 4.19.146-syzkaller #0
================================================================================
UBSAN: Undefined behaviour in fs/jfs/jfs_imap.c:458:7
shift exponent -6144 is negative
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x22c/0x33e lib/dump_stack.c:118
ubsan_epilogue+0xe/0x3a lib/ubsan.c:161
__ubsan_handle_shift_out_of_bounds.cold+0x1c4/0x250 lib/ubsan.c:422
diReadSpecial.cold+0x1b/0x3e fs/jfs/jfs_imap.c:458
jfs_mount+0x83/0x3d0 fs/jfs/jfs_mount.c:98
jfs_fill_super+0x55c/0xb50 fs/jfs/super.c:589
mount_bdev+0x2fc/0x3b0 fs/super.c:1158
mount_fs+0xa3/0x318 fs/super.c:1261
vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
vfs_kern_mount fs/namespace.c:951 [inline]
do_new_mount fs/namespace.c:2469 [inline]
do_mount+0x51c/0x2f10 fs/namespace.c:2799
ksys_mount+0xcf/0x130 fs/namespace.c:3015
__do_sys_mount fs/namespace.c:3029 [inline]
__se_sys_mount fs/namespace.c:3026 [inline]
__x64_sys_mount+0xba/0x150 fs/namespace.c:3026
do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x446d4a
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x22c/0x33e lib/dump_stack.c:118
ubsan_epilogue+0xe/0x3a lib/ubsan.c:161
__ubsan_handle_shift_out_of_bounds.cold+0x1c4/0x250 lib/ubsan.c:422
diReadSpecial.cold+0x1b/0x3e fs/jfs/jfs_imap.c:458
jfs_mount+0x83/0x3d0 fs/jfs/jfs_mount.c:98
jfs_fill_super+0x55c/0xb50 fs/jfs/super.c:589
mount_bdev+0x2fc/0x3b0 fs/super.c:1158
mount_fs+0xa3/0x318 fs/super.c:1261
vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
vfs_kern_mount fs/namespace.c:951 [inline]
do_new_mount fs/namespace.c:2469 [inline]
do_mount+0x51c/0x2f10 fs/namespace.c:2799
ksys_mount+0xcf/0x130 fs/namespace.c:3015
__do_sys_mount fs/namespace.c:3029 [inline]
__se_sys_mount fs/namespace.c:3026 [inline]
__x64_sys_mount+0xba/0x150 fs/namespace.c:3026
do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd ad fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 da ad fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007ffdd8c8cc18 EFLAGS: 00000283 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffdd8c8cc70 RCX: 0000000000446d4a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffdd8c8cc30
RBP: 00007ffdd8c8cc30 R08: 00007ffdd8c8cc70 R09: 00007ffd00000015
R10: 0000000000000000 R11: 0000000000000283 R12: 0000000000000001
R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003
================================================================================
================================================================================
UBSAN: Undefined behaviour in fs/jfs/jfs_imap.c:126:7
shift exponent -6144 is negative
CPU: 1 PID: 6476 Comm: syz-executor088 Not tainted 4.19.146-syzkaller #0
================================================================================
UBSAN: Undefined behaviour in fs/jfs/jfs_imap.c:126:7
shift exponent -6144 is negative
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x22c/0x33e lib/dump_stack.c:118
ubsan_epilogue+0xe/0x3a lib/ubsan.c:161
__ubsan_handle_shift_out_of_bounds.cold+0x1c4/0x250 lib/ubsan.c:422
diMount.cold+0x17/0x1c fs/jfs/jfs_imap.c:126
jfs_mount+0xbf/0x3d0 fs/jfs/jfs_mount.c:111
jfs_fill_super+0x55c/0xb50 fs/jfs/super.c:589
mount_bdev+0x2fc/0x3b0 fs/super.c:1158
mount_fs+0xa3/0x318 fs/super.c:1261
vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
vfs_kern_mount fs/namespace.c:951 [inline]
do_new_mount fs/namespace.c:2469 [inline]
do_mount+0x51c/0x2f10 fs/namespace.c:2799
ksys_mount+0xcf/0x130 fs/namespace.c:3015
__do_sys_mount fs/namespace.c:3029 [inline]
__se_sys_mount fs/namespace.c:3026 [inline]
__x64_sys_mount+0xba/0x150 fs/namespace.c:3026
do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x446d4a
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x22c/0x33e lib/dump_stack.c:118
ubsan_epilogue+0xe/0x3a lib/ubsan.c:161
__ubsan_handle_shift_out_of_bounds.cold+0x1c4/0x250 lib/ubsan.c:422
diMount.cold+0x17/0x1c fs/jfs/jfs_imap.c:126
jfs_mount+0xbf/0x3d0 fs/jfs/jfs_mount.c:111
jfs_fill_super+0x55c/0xb50 fs/jfs/super.c:589
mount_bdev+0x2fc/0x3b0 fs/super.c:1158
mount_fs+0xa3/0x318 fs/super.c:1261
vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
vfs_kern_mount fs/namespace.c:951 [inline]
do_new_mount fs/namespace.c:2469 [inline]
do_mount+0x51c/0x2f10 fs/namespace.c:2799
ksys_mount+0xcf/0x130 fs/namespace.c:3015
__do_sys_mount fs/namespace.c:3029 [inline]
__se_sys_mount fs/namespace.c:3026 [inline]
__x64_sys_mount+0xba/0x150 fs/namespace.c:3026
do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd ad fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 da ad fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007ffdd8c8cc18 EFLAGS: 00000283 ORIG_RAX: 00000000000000a5
RAX: ff
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