syzbot


WARNING in show_mark_fhandle

Status: moderation: reported on 2024/06/26 05:10
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+d2934e73a6b0e52ac572@syzkaller.appspotmail.com
First crash: 21d, last: 21d

Sample crash report:
------------[ cut here ]------------
Can't encode file handler for inotify: 255
WARNING: CPU: 0 PID: 5369 at fs/notify/fdinfo.c:51 show_mark_fhandle+0x204/0x220 fs/notify/fdinfo.c:51
Modules linked in:
CPU: 0 PID: 5369 Comm: syz-executor.1 Not tainted 6.10.0-rc4-syzkaller-00164-g66cc544fd75c #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:show_mark_fhandle+0x204/0x220 fs/notify/fdinfo.c:51
Code: 31 ff 89 ee e8 0d a5 7e ff 40 84 ed 75 92 e8 63 aa 7e ff c6 05 e4 6e bc 0d 01 90 48 c7 c7 80 63 3e 8b 89 de e8 4d 2b 41 ff 90 <0f> 0b 90 90 e9 6d ff ff ff e8 2e d7 db ff e9 3b ff ff ff e8 04 13
RSP: 0018:ffffc900037878c0 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 00000000000000ff RCX: ffffc9002319a000
RDX: 0000000000040000 RSI: ffffffff81511296 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000002 R12: ffff888020e7ade0
R13: dffffc0000000000 R14: 1ffff920006f0f18 R15: 0000000000000010
FS:  0000000000000000(0000) GS:ffff88802c000000(0063) knlGS:00000000f5ef0b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000003352d000 CR3: 0000000012b3a000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 inotify_fdinfo+0x223/0x2d0 fs/notify/fdinfo.c:86
 show_fdinfo.isra.0+0x1e4/0x380 fs/notify/fdinfo.c:34
 seq_show+0x574/0x910 fs/proc/fd.c:68
 seq_read_iter+0x4fa/0x12c0 fs/seq_file.c:230
 seq_read+0x390/0x4d0 fs/seq_file.c:162
 vfs_read+0x1d4/0xbd0 fs/read_write.c:474
 ksys_pread64+0x176/0x1a0 fs/read_write.c:671
 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: 0023:0xf72fe579
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:00000000f5ef05ac EFLAGS: 00000292 ORIG_RAX: 00000000000000b4
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000020000080
RDX: 00000000000000ed RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	10 06                	adc    %al,(%rsi)
   2:	03 74 b4 01          	add    0x1(%rsp,%rsi,4),%esi
   6:	10 07                	adc    %al,(%rdi)
   8:	03 74 b0 01          	add    0x1(%rax,%rsi,4),%esi
   c:	10 08                	adc    %cl,(%rax)
   e:	03 74 d8 01          	add    0x1(%rax,%rbx,8),%esi
  1e:	00 51 52             	add    %dl,0x52(%rcx)
  21:	55                   	push   %rbp
  22:	89 e5                	mov    %esp,%ebp
  24:	0f 34                	sysenter
  26:	cd 80                	int    $0x80
* 28:	5d                   	pop    %rbp <-- trapping instruction
  29:	5a                   	pop    %rdx
  2a:	59                   	pop    %rcx
  2b:	c3                   	ret
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	90                   	nop
  2f:	90                   	nop
  30:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi
  37:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/22 05:07 upstream 66cc544fd75c c2e07261 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in show_mark_fhandle
2024/06/22 05:06 upstream 66cc544fd75c c2e07261 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in show_mark_fhandle
* Struck through repros no longer work on HEAD.