Hello,
syzbot found the following issue on:
HEAD commit: bc7618b4936f Merge 5.10.147 into android12-5.10-lts
git tree: android12-5.10-lts
console+strace:
https://syzkaller.appspot.com/x/log.txt?x=11e75da2880000
kernel config:
https://syzkaller.appspot.com/x/.config?x=a0307d61dbe4e66
dashboard link:
https://syzkaller.appspot.com/bug?extid=e00d1302e217068ee641
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:
https://syzkaller.appspot.com/x/repro.syz?x=1566e5a2880000
C reproducer:
https://syzkaller.appspot.com/x/repro.c?x=13bcbbec880000
Downloadable assets:
disk image:
https://storage.googleapis.com/syzbot-assets/a32aa1c53771/disk-bc7618b4.raw.xz
vmlinux:
https://storage.googleapis.com/syzbot-assets/06054a04d86a/vmlinux-bc7618b4.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by:
syzbot+e00d13...@syzkaller.appspotmail.com
RBP: 00007ffd12e028f0 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000004
R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000
---[ end trace 88d494f2e1e9ee48 ]---
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 381 Comm: syz-executor102 Tainted: G W 5.10.147-syzkaller-01341-gbc7618b4936f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
RIP: 0010:strlen+0x3a/0x80 lib/string.c:568
Code: c0 ff ff ff ff 49 bf 00 00 00 00 00 fc ff df 48 89 fb 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 49 89 c4 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 75 12 48 ff c3 49 8d 44 24 01 43 80 7c 26 01
RSP: 0018:ffffc900009bfb68 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff8881067de2c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900009bfb88 R08: ffffffff81d1c9bc R09: fffff52000137f75
R10: fffff52000137f75 R11: 1ffff92000137f74 R12: ffffffffffffffff
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
FS: 000055555728f300(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055cd7ad33028 CR3: 00000001049ba000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
kernfs_name_hash+0x21/0x240 fs/kernfs/dir.c:310
kernfs_find_ns+0x72/0x280 fs/kernfs/dir.c:849
kernfs_remove_by_name_ns+0x36/0x90 fs/kernfs/dir.c:1521
kernfs_remove_by_name include/linux/kernfs.h:608 [inline]
sysfs_remove_link+0x50/0x60 fs/sysfs/symlink.c:152
del_gendisk+0xbe0/0xe20 block/genhd.c:951
loop_remove+0x46/0xb0 drivers/block/loop.c:2190
loop_control_ioctl+0x67f/0x740 drivers/block/loop.c:2289
vfs_ioctl fs/ioctl.c:48 [inline]
__do_sys_ioctl fs/ioctl.c:753 [inline]
__se_sys_ioctl+0x115/0x190 fs/ioctl.c:739
__x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:739
do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7f00ac830069
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd12e028d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f00ac830069
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000003
RBP: 00007ffd12e028f0 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000004
R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace 88d494f2e1e9ee49 ]---
RIP: 0010:strlen+0x3a/0x80 lib/string.c:568
Code: c0 ff ff ff ff 49 bf 00 00 00 00 00 fc ff df 48 89 fb 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 49 89 c4 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 75 12 48 ff c3 49 8d 44 24 01 43 80 7c 26 01
RSP: 0018:ffffc900009bfb68 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff8881067de2c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900009bfb88 R08: ffffffff81d1c9bc R09: fffff52000137f75
R10: fffff52000137f75 R11: 1ffff92000137f74 R12: ffffffffffffffff
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
FS: 000055555728f300(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055cd7ad33028 CR3: 00000001049ba000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 5 bytes skipped:
0: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15
7: fc ff df
a: 48 89 fb mov %rdi,%rbx
d: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1)
14: 00 00 00 00
18: 0f 1f 00 nopl (%rax)
1b: 49 89 c4 mov %rax,%r12
1e: 48 89 d8 mov %rbx,%rax
21: 48 c1 e8 03 shr $0x3,%rax
* 25: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax <-- trapping instruction
2a: 84 c0 test %al,%al
2c: 75 12 jne 0x40
2e: 48 ff c3 inc %rbx
31: 49 8d 44 24 01 lea 0x1(%r12),%rax
36: 43 rex.XB
37: 80 .byte 0x80
38: 7c 26 jl 0x60
3a: 01 .byte 0x1
---
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