Hello,
syzbot found the following crash on:
HEAD commit: 1656b145 Linux 4.19.40
git tree: linux-4.19.y
console output:
https://syzkaller.appspot.com/x/log.txt?x=16fd0410a00000
kernel config:
https://syzkaller.appspot.com/x/.config?x=9d87ef9272ca3a1
dashboard link:
https://syzkaller.appspot.com/bug?extid=0b3fae6fc3c4feb104a4
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by:
syzbot+0b3fae...@syzkaller.appspotmail.com
------------[ cut here ]------------
kernel BUG at fs/buffer.c:553!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 13013 Comm: syz-executor.0 Not tainted 4.19.40 #8
kobject: 'loop4' (0000000096f9265d): kobject_uevent_env
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:mark_buffer_dirty_inode fs/buffer.c:553 [inline]
RIP: 0010:mark_buffer_dirty_inode+0x30f/0x410 fs/buffer.c:544
Code: 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 4d 4c 89 63
58 4c 89 ef e8 8b 03 38 05 e9 ee fd ff ff e8 91 ab b2 ff <0f> 0b 4c 89 ff
e8 f7 21 e9 ff e9 d3 fd ff ff e8 ed 21 e9 ff e9 5b
loop_reread_partitions: partition scan of loop0 (p ��|��' $� �>B�� � T� ՜�)
failed (rc=-16)
RSP: 0018:ffff888055266d28 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff88805d27b7e0 RCX: ffffc90005e77000
RDX: 0000000000040000 RSI: ffffffff81b8d50f RDI: ffff88805d1a3ee0
RBP: ffff888055266d68 R08: ffff888056422100 R09: 0000000000000003
R10: ffffed1015d24732 R11: ffff8880ae923993 R12: ffff88805d1a3d80
R13: 0000000000000000 R14: ffff8880a6cc73d8 R15: ffff888055267010
FS: 00007f5fcc6d9700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32d23000 CR3: 00000000a0ad5000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
kobject: 'loop4' (0000000096f9265d): fill_kobj_path: path
= '/devices/virtual/block/loop4'
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
fat16_ent_put+0xd2/0x110 fs/fat/fatent.c:182
fat_alloc_clusters+0x63e/0xf40 fs/fat/fatent.c:500
fat_add_cluster+0x6f/0x100 fs/fat/inode.c:101
kobject: 'loop1' (0000000046e97258): kobject_uevent_env
kobject: 'loop1' (0000000046e97258): fill_kobj_path: path
= '/devices/virtual/block/loop1'
__fat_get_block fs/fat/inode.c:148 [inline]
fat_get_block+0x344/0x970 fs/fat/inode.c:183
__block_write_begin_int+0x4e0/0x1920 fs/buffer.c:1967
kobject: 'loop3' (00000000f349b21d): kobject_uevent_env
kobject: 'loop3' (00000000f349b21d): fill_kobj_path: path
= '/devices/virtual/block/loop3'
__block_write_begin fs/buffer.c:2017 [inline]
block_write_begin+0x5f/0x1e0 fs/buffer.c:2076
cont_write_begin+0x4fa/0x8c0 fs/buffer.c:2429
fat_write_begin+0x8d/0x120 fs/fat/inode.c:229
generic_perform_write+0x231/0x530 mm/filemap.c:3139
__generic_file_write_iter+0x25e/0x630 mm/filemap.c:3264
generic_file_write_iter+0x383/0x730 mm/filemap.c:3292
call_write_iter include/linux/fs.h:1817 [inline]
new_sync_write fs/read_write.c:474 [inline]
__vfs_write+0x58e/0x820 fs/read_write.c:487
__kernel_write+0x110/0x390 fs/read_write.c:506
write_pipe_buf+0x15d/0x1f0 fs/splice.c:798
splice_from_pipe_feed fs/splice.c:503 [inline]
__splice_from_pipe+0x39a/0x7e0 fs/splice.c:627
splice_from_pipe+0x108/0x170 fs/splice.c:662
default_file_splice_write+0x3c/0x90 fs/splice.c:810
do_splice_from fs/splice.c:852 [inline]
direct_splice_actor+0x126/0x1a0 fs/splice.c:1019
splice_direct_to_actor+0x2ea/0x890 fs/splice.c:974
do_splice_direct+0x1da/0x2a0 fs/splice.c:1062
do_sendfile+0x597/0xce0 fs/read_write.c:1446
__do_sys_sendfile64 fs/read_write.c:1501 [inline]
__se_sys_sendfile64 fs/read_write.c:1493 [inline]
__x64_sys_sendfile64+0x15a/0x220 fs/read_write.c:1493
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458da9
Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f5fcc6d8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000458da9
RDX: 0000000020000000 RSI: 0000000000000004 RDI: 0000000000000004
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 00008080fffffffe R11: 0000000000000246 R12: 00007f5fcc6d96d4
R13: 00000000004c5fa3 R14: 00000000004da748 R15: 00000000ffffffff
Modules linked in:
---[ end trace 61665b5cc1d41589 ]---
RIP: 0010:mark_buffer_dirty_inode fs/buffer.c:553 [inline]
RIP: 0010:mark_buffer_dirty_inode+0x30f/0x410 fs/buffer.c:544
Code: 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 4d 4c 89 63
58 4c 89 ef e8 8b 03 38 05 e9 ee fd ff ff e8 91 ab b2 ff <0f> 0b 4c 89 ff
e8 f7 21 e9 ff e9 d3 fd ff ff e8 ed 21 e9 ff e9 5b
RSP: 0018:ffff888055266d28 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff88805d27b7e0 RCX: ffffc90005e77000
RDX: 0000000000040000 RSI: ffffffff81b8d50f RDI: ffff88805d1a3ee0
kobject: 'loop2' (00000000631dce8b): kobject_uevent_env
print_req_error: I/O error, dev loop0, sector 0
print_req_error: I/O error, dev loop0, sector 0
kobject: 'loop2' (00000000631dce8b): fill_kobj_path: path
= '/devices/virtual/block/loop2'
Buffer I/O error on dev loop0, logical block 0, async page read
print_req_error: I/O error, dev loop0, sector 0
Buffer I/O error on dev loop0, logical block 0, async page read
print_req_error: I/O error, dev loop0, sector 0
Buffer I/O error on dev loop0, logical block 0, async page read
print_req_error: I/O error, dev loop0, sector 0
Buffer I/O error on dev loop0, logical block 0, async page read
kobject: 'loop1' (0000000046e97258): kobject_uevent_env
print_req_error: I/O error, dev loop0, sector 0
Buffer I/O error on dev loop0, logical block 0, async page read
print_req_error: I/O error, dev loop0, sector 0
Buffer I/O error on dev loop0, logical block 0, async page read
kobject: 'loop1' (0000000046e97258): fill_kobj_path: path
= '/devices/virtual/block/loop1'
print_req_error: I/O error, dev loop0, sector 0
Buffer I/O error on dev loop0, logical block 0, async page read
print_req_error: I/O error, dev loop0, sector 0
Buffer I/O error on dev loop0, logical block 0, async page read
print_req_error: I/O error, dev loop0, sector 0
Buffer I/O error on dev loop0, logical block 0, async page read
RBP: ffff888055266d68 R08: ffff888056422100 R09: 0000000000000003
Buffer I/O error on dev loop0, logical block 0, async page read
R10: ffffed1015d24732 R11: ffff8880ae923993 R12: ffff88805d1a3d80
R13: 0000000000000000 R14: ffff8880a6cc73d8 R15: ffff888055267010
kobject: 'loop5' (000000006040a904): kobject_uevent_env
FS: 00007f5fcc6d9700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kobject: 'loop5' (000000006040a904): fill_kobj_path: path
= '/devices/virtual/block/loop5'
CR2: 000000000070d158 CR3: 00000000a0ad5000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400