syzbot


general protection fault in btrfs_run_delalloc_range

Status: moderation: reported on 2024/06/30 12:28
Subsystems: btrfs
[Documentation on labels]
Reported-by: syzbot+6ad0dc1ee63acacee849@syzkaller.appspotmail.com
First crash: 22d, last: 22d

Sample crash report:
BTRFS info (device loop2): checking UUID tree
Oops: general protection fault, probably for non-canonical address 0xffdffc00001ffff4: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: maybe wild-memory-access in range [0xff00000000ffffa0-0xff00000000ffffa7]
CPU: 3 PID: 5357 Comm: syz.2.26 Not tainted 6.10.0-rc5-syzkaller-00018-g55027e689933 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:__lock_acquire+0xe3e/0x3b30 kernel/locking/lockdep.c:5005
Code: 11 00 00 39 05 33 56 1f 12 0f 82 be 05 00 00 ba 01 00 00 00 e9 e4 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 82 1f 00 00 49 81 3c 24 e0 cd e2 92 0f 84 98 f2
RSP: 0018:ffffc90003976dc8 EFLAGS: 00010802
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 1fe00000001ffff4 RSI: ffff88801bec8000 RDI: ff00000000ffffa0
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8fe2a217 R11: 0000000000000002 R12: ff00000000ffffa0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88802c300000(0063) knlGS:00000000f5cfab40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f73c75a0 CR3: 0000000054ab0000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 __queue_work+0x39e/0x1020 kernel/workqueue.c:2319
 queue_work_on+0x11a/0x140 kernel/workqueue.c:2410
 run_delalloc_compressed fs/btrfs/inode.c:1731 [inline]
 btrfs_run_delalloc_range+0x945/0xf80 fs/btrfs/inode.c:2308
 writepage_delalloc+0x16a/0x360 fs/btrfs/extent_io.c:1244
 __extent_writepage fs/btrfs/extent_io.c:1496 [inline]
 extent_write_cache_pages+0x84e/0x1ce0 fs/btrfs/extent_io.c:2173
 btrfs_writepages+0x21b/0x4a0 fs/btrfs/extent_io.c:2294
 do_writepages+0x1a3/0x7f0 mm/page-writeback.c:2634
 filemap_fdatawrite_wbc mm/filemap.c:397 [inline]
 filemap_fdatawrite_wbc+0x148/0x1c0 mm/filemap.c:387
 __filemap_fdatawrite_range+0xba/0x100 mm/filemap.c:430
 btrfs_fdatawrite_range+0x4a/0x110 fs/btrfs/file.c:4066
 start_ordered_ops.constprop.0+0x96/0xe0 fs/btrfs/file.c:1753
 btrfs_sync_file+0x1fd/0xe10 fs/btrfs/file.c:1828
 vfs_fsync_range+0x141/0x230 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2794 [inline]
 btrfs_do_write_iter+0x584/0x10c0 fs/btrfs/file.c:1705
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x6b6/0x1140 fs/read_write.c:590
 ksys_write+0x12f/0x260 fs/read_write.c:643
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf73e2579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f5cfa57c EFLAGS: 00000292 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000020000040
RDX: 0000000000000118 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__lock_acquire+0xe3e/0x3b30 kernel/locking/lockdep.c:5005
Code: 11 00 00 39 05 33 56 1f 12 0f 82 be 05 00 00 ba 01 00 00 00 e9 e4 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 82 1f 00 00 49 81 3c 24 e0 cd e2 92 0f 84 98 f2
RSP: 0018:ffffc90003976dc8 EFLAGS: 00010802
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 1fe00000001ffff4 RSI: ffff88801bec8000 RDI: ff00000000ffffa0
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8fe2a217 R11: 0000000000000002 R12: ff00000000ffffa0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88802c300000(0063) knlGS:00000000f5cfab40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f73c75a0 CR3: 0000000054ab0000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	11 00                	adc    %eax,(%rax)
   2:	00 39                	add    %bh,(%rcx)
   4:	05 33 56 1f 12       	add    $0x121f5633,%eax
   9:	0f 82 be 05 00 00    	jb     0x5cd
   f:	ba 01 00 00 00       	mov    $0x1,%edx
  14:	e9 e4 00 00 00       	jmp    0xfd
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	4c 89 e2             	mov    %r12,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 82 1f 00 00    	jne    0x1fb6
  34:	49 81 3c 24 e0 cd e2 	cmpq   $0xffffffff92e2cde0,(%r12)
  3b:	92
  3c:	0f                   	.byte 0xf
  3d:	84                   	.byte 0x84
  3e:	98                   	cwtl
  3f:	f2                   	repnz

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/26 12:25 upstream 55027e689933 dec8bc94 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in btrfs_run_delalloc_range
* Struck through repros no longer work on HEAD.