syzbot


general protection fault in ext4_release_dquot

Status: auto-obsoleted due to no activity on 2023/08/07 07:51
Subsystems: ext4
[Documentation on labels]
Reported-by: syzbot+1536e19aa38aef752cec@syzkaller.appspotmail.com
First crash: 324d, last: 324d
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-15 general protection fault in ext4_release_dquot 1 309d 309d 0/2 auto-obsoleted due to no activity on 2023/08/22 08:55

Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 0 PID: 5034 Comm: syz-executor.3 Not tainted 6.4.0-rc1-syzkaller-00001-gba0ad6ed89fd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
RIP: 0010:ext4_release_dquot+0x1f3/0x3a0 fs/ext4/super.c:6817
Code: 9c df 30 02 00 00 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 cb 33 96 ff 48 8b 1b 48 83 c3 28 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 ae 33 96 ff bd 78 06 00 00 48 03
RSP: 0018:ffffc90003e0f918 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 0000000000000028 RCX: ffff88802c088000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000100 R08: ffffffff824d0128 R09: fffffbfff1982901
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff11006b9fccc
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880693f0000
FS:  0000555556443400(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2dc21000 CR3: 000000004037d000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dqput+0x1da/0x860 fs/quota/dquot.c:812
 dqput_all fs/quota/dquot.c:396 [inline]
 __dquot_drop fs/quota/dquot.c:1590 [inline]
 dquot_drop+0x222/0x2a0 fs/quota/dquot.c:1615
 ext4_clear_inode+0x5a/0x1b0 fs/ext4/super.c:1492
 ext4_evict_inode+0xaa9/0xf20 fs/ext4/inode.c:318
 evict+0x2a4/0x620 fs/inode.c:665
 dispose_list fs/inode.c:698 [inline]
 evict_inodes+0x5f8/0x690 fs/inode.c:748
 generic_shutdown_super+0x98/0x340 fs/super.c:479
 kill_block_super+0x84/0xf0 fs/super.c:1407
 deactivate_locked_super+0xa4/0x110 fs/super.c:331
 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1177
 task_work_run+0x24a/0x300 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xd9/0x100 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:297
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd0e108d5d7
Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdca96fd38 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fd0e108d5d7
RDX: 00007ffdca96fe0a RSI: 000000000000000a RDI: 00007ffdca96fe00
RBP: 00007ffdca96fe00 R08: 00000000ffffffff R09: 00007ffdca96fbd0
R10: 0000555556444893 R11: 0000000000000246 R12: 00007fd0e10e6cdc
R13: 00007ffdca970ec0 R14: 0000555556444810 R15: 00007ffdca970f00
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_release_dquot+0x1f3/0x3a0 fs/ext4/super.c:6817
Code: 9c df 30 02 00 00 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 cb 33 96 ff 48 8b 1b 48 83 c3 28 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 ae 33 96 ff bd 78 06 00 00 48 03
RSP: 0018:ffffc90003e0f918 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 0000000000000028 RCX: ffff88802c088000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000100 R08: ffffffff824d0128 R09: fffffbfff1982901
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff11006b9fccc
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880693f0000
FS:  0000555556443400(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fac1edfa000 CR3: 000000004037d000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	9c                   	pushfq
   1:	df 30                	fbstp  (%rax)
   3:	02 00                	add    (%rax),%al
   5:	00 48 89             	add    %cl,-0x77(%rax)
   8:	d8 48 c1             	fmuls  -0x3f(%rax)
   b:	e8 03 42 80 3c       	callq  0x3c804213
  10:	28 00                	sub    %al,(%rax)
  12:	74 08                	je     0x1c
  14:	48 89 df             	mov    %rbx,%rdi
  17:	e8 cb 33 96 ff       	callq  0xff9633e7
  1c:	48 8b 1b             	mov    (%rbx),%rbx
  1f:	48 83 c3 28          	add    $0x28,%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 ae 33 96 ff       	callq  0xff9633e7
  39:	bd 78 06 00 00       	mov    $0x678,%ebp
  3e:	48                   	rex.W
  3f:	03                   	.byte 0x3

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/05/09 07:51 upstream ba0ad6ed89fd c7a5e2a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs general protection fault in ext4_release_dquot
* Struck through repros no longer work on HEAD.