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* WARNING in submit_bio_checks
@ 2020-07-11  5:34 syzbot
  2020-07-13 10:18 ` Christoph Hellwig
  2020-07-16  5:00 ` syzbot
  0 siblings, 2 replies; 5+ messages in thread
From: syzbot @ 2020-07-11  5:34 UTC (permalink / raw)
  To: andriin, ast, axboe, bpf, daniel, john.fastabend, kafai, kpsingh,
	linux-block, linux-kernel, netdev, songliubraving,
	syzkaller-bugs, yhs


syzbot found the following crash on:

HEAD commit:    9e50b94b Add linux-next specific files for 20200703
git tree:       linux-next
console output:
kernel config:
dashboard link:
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:
C reproducer:

IMPORTANT: if you fix the bug, please add the following tag to the commit:

------------[ cut here ]------------
Trying to write to read-only block-device nullb0 (partno 0)
WARNING: CPU: 0 PID: 6821 at block/blk-core.c:857 bio_check_ro block/blk-core.c:857 [inline]
WARNING: CPU: 0 PID: 6821 at block/blk-core.c:857 submit_bio_checks+0x1aba/0x1f70 block/blk-core.c:985
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 6821 Comm: syz-executor914 Not tainted 5.8.0-rc3-next-20200703-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+0x18f/0x20d lib/dump_stack.c:118
 panic+0x2e3/0x75c kernel/panic.c:231
 __warn.cold+0x20/0x45 kernel/panic.c:600
 report_bug+0x1bd/0x210 lib/bug.c:198
 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:235
 exc_invalid_op+0x13/0x40 arch/x86/kernel/traps.c:255
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:563
RIP: 0010:bio_check_ro block/blk-core.c:857 [inline]
RIP: 0010:submit_bio_checks+0x1aba/0x1f70 block/blk-core.c:985
Code: 04 00 00 45 8b a4 24 a4 05 00 00 48 8d 74 24 68 48 89 ef e8 b8 21 fe ff 48 c7 c7 e0 ce 91 88 48 89 c6 44 89 e2 e8 08 df c0 fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02
RSP: 0018:ffffc90001277338 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff8880a0cb2240 RCX: 0000000000000000
RDX: ffff8880a8ebc180 RSI: ffffffff815d7d27 RDI: fffff5200024ee59
RBP: ffff8880a03101c0 R08: 0000000000000001 R09: ffff8880ae6318e7
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880a03101c8 R14: 0000000000000000 R15: ffff8880a03101e8
 submit_bio_noacct+0x89/0x12d0 block/blk-core.c:1198
 submit_bio+0x263/0x5b0 block/blk-core.c:1283
 submit_bh_wbc+0x685/0x8e0 fs/buffer.c:3105
 __block_write_full_page+0x837/0x12e0 fs/buffer.c:1848
 block_write_full_page+0x214/0x270 fs/buffer.c:3034
 __writepage+0x60/0x170 mm/page-writeback.c:2311
 write_cache_pages+0x736/0x11b0 mm/page-writeback.c:2246
 generic_writepages mm/page-writeback.c:2337 [inline]
 generic_writepages+0xe2/0x150 mm/page-writeback.c:2326
 do_writepages+0xec/0x290 mm/page-writeback.c:2352
 __filemap_fdatawrite_range+0x2a1/0x380 mm/filemap.c:422
 filemap_write_and_wait_range mm/filemap.c:655 [inline]
 filemap_write_and_wait_range+0xe1/0x1c0 mm/filemap.c:649
 filemap_write_and_wait include/linux/fs.h:2629 [inline]
 __sync_blockdev fs/block_dev.c:480 [inline]
 sync_blockdev fs/block_dev.c:489 [inline]
 __blkdev_put+0x69a/0x890 fs/block_dev.c:1863
 blkdev_close+0x8c/0xb0 fs/block_dev.c:1947
 __fput+0x33c/0x880 fs/file_table.c:281
 task_work_run+0xdd/0x190 kernel/task_work.c:135
 exit_task_work include/linux/task_work.h:25 [inline]
 do_exit+0xb72/0x2a40 kernel/exit.c:806
 do_group_exit+0x125/0x310 kernel/exit.c:904
 __do_sys_exit_group kernel/exit.c:915 [inline]
 __se_sys_exit_group kernel/exit.c:913 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:913
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:367
RIP: 0033:0x43ee48
Code: Bad RIP value.
RSP: 002b:00007ffdd4c8f808 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ee48
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
RBP: 00000000004be648 R08: 00000000000000e7 R09: ffffffffffffffd0
R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..

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^ permalink raw reply	[flat|nested] 5+ messages in thread
* WARNING in submit_bio_checks
@ 2021-09-03  7:41 Hao Sun
  0 siblings, 0 replies; 5+ messages in thread
From: Hao Sun @ 2021-09-03  7:41 UTC (permalink / raw)
  To: axboe, linux-block
  Cc: andrii, ast, bpf, daniel, john.fastabend, kafai, kpsingh,
	linux-kernel, netdev, songliubraving, yhs


When using Healer to fuzz the latest Linux kernel, the following crash
was triggered.

HEAD commit: 7d2a07b76933 Linux 5.14
git tree: upstream
console output:
kernel config:
C reproducer:
Syzlang reproducer:

If you fix this issue, please add the following tag to the commit:
Reported-by: Hao Sun <>

------------[ cut here ]------------
Trying to write to read-only block-device nullb0 (partno 0)
WARNING: CPU: 1 PID: 11327 at block/blk-core.c:700 bio_check_ro
block/blk-core.c:700 [inline]
WARNING: CPU: 1 PID: 11327 at block/blk-core.c:700
submit_bio_checks+0x1605/0x1a70 block/blk-core.c:813
Modules linked in:
CPU: 1 PID: 11327 Comm: syz-executor Not tainted 5.14.0 #25
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
RIP: 0010:bio_check_ro block/blk-core.c:700 [inline]
RIP: 0010:submit_bio_checks+0x1605/0x1a70 block/blk-core.c:813
Code: 00 00 45 0f b6 a4 24 90 05 00 00 48 8d 74 24 60 48 89 ef e8 8d
54 fe ff 48 c7 c7 e0 b7 de 89 48 89 c6 44 89 e2 e8 ac 9e 1a 05 <0f> 0b
e9 91 f3 ff ff e8 8f fc b1 fd e8 9a d5 5b 05 31 ff 89 c3 89
RSP: 0018:ffffc90004007198 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff888100ec6430 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff88810338d640 RDI: fffff52000800e25
RBP: ffff8881140748c0 R08: ffffffff815d0995 R09: 0000000000000000
R10: 0000000000000005 R11: ffffed10233e3f53 R12: 0000000000000000
R13: ffff8881140748d0 R14: ffff8881083c21c0 R15: ffff888100ec69a4
FS:  0000000000000000(0000) GS:ffff888119f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000556c5662e990 CR3: 000000000b68e001 CR4: 0000000000770ee0
PKRU: 55555554
Call Trace:
 submit_bio_noacct+0x96/0x1460 block/blk-core.c:1028
 submit_bio+0x10a/0x460 block/blk-core.c:1105
 submit_bh_wbc+0x5eb/0x7f0 fs/buffer.c:3050
 __block_write_full_page+0x853/0x13a0 fs/buffer.c:1805
 block_write_full_page+0x4f3/0x610 fs/buffer.c:2976
 __writepage+0x60/0x180 mm/page-writeback.c:2314
 write_cache_pages+0x78e/0x1280 mm/page-writeback.c:2249
 generic_writepages mm/page-writeback.c:2340 [inline]
 generic_writepages+0xed/0x160 mm/page-writeback.c:2329
 do_writepages+0xfa/0x2a0 mm/page-writeback.c:2355
 __filemap_fdatawrite_range+0x2aa/0x390 mm/filemap.c:413
 filemap_write_and_wait_range mm/filemap.c:686 [inline]
 filemap_write_and_wait_range+0x65/0x100 mm/filemap.c:680
 filemap_write_and_wait include/linux/fs.h:2897 [inline]
 __sync_blockdev+0x84/0xe0 fs/block_dev.c:526
 sync_blockdev fs/block_dev.c:535 [inline]
 blkdev_put+0x53f/0x720 fs/block_dev.c:1532
 blkdev_close+0x8c/0xb0 fs/block_dev.c:1586
 __fput+0x288/0x920 fs/file_table.c:280
 task_work_run+0xe0/0x1a0 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0xbe4/0x2e00 kernel/exit.c:825
 do_group_exit+0x125/0x340 kernel/exit.c:922
 get_signal+0x4d5/0x25a0 kernel/signal.c:2808
 arch_do_signal_or_restart+0x2ed/0x1c40 arch/x86/kernel/signal.c:865
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x192/0x2a0 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
RIP: 0033:0x4739cd
Code: Unable to access opcode bytes at RIP 0x4739a3.
RSP: 002b:00007f9d66b2a218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000000 RBX: 000000000059c0a0 RCX: 00000000004739cd
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000059c0a8
RBP: 000000000059c0a8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000059c0ac
R13: 00007ffdcc4a841f R14: 00007ffdcc4a85c0 R15: 00007f9d66b2a300

^ permalink raw reply	[flat|nested] 5+ messages in thread

end of thread, other threads:[~2021-09-03  7:41 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-07-11  5:34 WARNING in submit_bio_checks syzbot
2020-07-13 10:18 ` Christoph Hellwig
2020-07-13 16:16   ` Eric Biggers
2020-07-16  5:00 ` syzbot
2021-09-03  7:41 Hao Sun

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