syzbot


general protection fault in __io_arm_poll_handler
Status: upstream: reported C repro on 2021/09/03 20:28
Reported-by: syzbot+ba74b85fa15fd7a96437@syzkaller.appspotmail.com
First crash: 266d, last: 264d

Cause bisection: introduced by (bisect log) :
commit 884a76881fc5f5c9c04de1b640bed2c340929842
Author: David Howells <dhowells@redhat.com>
Date: Mon Feb 10 10:00:22 2020 +0000

  fscache: Procfile to display cookies

Crash: WARNING: ODEBUG bug in netdev_run_todo (log)
Repro: C syz .config

Fix bisection: fixed by (bisect log) [no-op commit]:
commit ea0056f09a74d96ddad11b0c484961c011baba08
Author: Wei Li <liwei391@huawei.com>
Date: Wed Jul 14 01:50:00 2021 +0000

  perf trace: Update cmd string table to decode sys_bpf first arg

Patch testing requests:
Created Duration User Patch Repo Result
2021/09/03 20:38 38m axboe@kernel.dk git://git.kernel.dk/linux-block for-5.15/io_uring OK

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: 1 PID: 8812 Comm: iou-sqp-8804 Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:vfs_poll include/linux/poll.h:88 [inline]
RIP: 0010:__io_arm_poll_handler+0x2fa/0xb10 fs/io_uring.c:5476
Code: 24 38 42 80 3c 20 00 74 08 48 89 ef e8 df 15 db ff 48 8b 6d 00 48 8d 5d 28 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 b8 15 db ff 4c 8b 23 49 83 c4 48 4c
RSP: 0018:ffffc90001e7f0a8 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 0000000000000028 RCX: dffffc0000000000
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc90001e7f1f0
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffff88801252e820
R10: ffffed10024a5d06 R11: 0000000000000000 R12: dffffc0000000000
R13: 1ffff920003cfe3f R14: ffffc90001e7f1fc R15: ffffc90001e7f1f8
FS:  00007f6951c24700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000049a01d CR3: 000000002b182000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 io_poll_add+0xf1/0x590 fs/io_uring.c:5751
 io_issue_sqe+0x192b/0x9280 fs/io_uring.c:6569
 __io_queue_sqe+0xe3/0x1000 fs/io_uring.c:6864
 tctx_task_work+0x2ad/0x560 fs/io_uring.c:2143
 task_work_run+0x146/0x1c0 kernel/task_work.c:164
 tracehook_notify_signal include/linux/tracehook.h:212 [inline]
 io_run_task_work+0x110/0x140 fs/io_uring.c:2403
 io_sq_thread+0xb5e/0x1220 fs/io_uring.c:7337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Modules linked in:
---[ end trace 65dffd9e454d7c44 ]---
RIP: 0010:vfs_poll include/linux/poll.h:88 [inline]
RIP: 0010:__io_arm_poll_handler+0x2fa/0xb10 fs/io_uring.c:5476
Code: 24 38 42 80 3c 20 00 74 08 48 89 ef e8 df 15 db ff 48 8b 6d 00 48 8d 5d 28 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 b8 15 db ff 4c 8b 23 49 83 c4 48 4c
RSP: 0018:ffffc90001e7f0a8 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 0000000000000028 RCX: dffffc0000000000
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc90001e7f1f0
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffff88801252e820
R10: ffffed10024a5d06 R11: 0000000000000000 R12: dffffc0000000000
R13: 1ffff920003cfe3f R14: ffffc90001e7f1fc R15: ffffc90001e7f1f8
FS:  00007f6951c24700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd472d29c0 CR3: 000000002b182000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	24 38                	and    $0x38,%al
   2:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
   7:	74 08                	je     0x11
   9:	48 89 ef             	mov    %rbp,%rdi
   c:	e8 df 15 db ff       	callq  0xffdb15f0
  11:	48 8b 6d 00          	mov    0x0(%rbp),%rbp
  15:	48 8d 5d 28          	lea    0x28(%rbp),%rbx
  19:	48 89 d8             	mov    %rbx,%rax
  1c:	48 c1 e8 03          	shr    $0x3,%rax
  20:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  27:	fc ff df
* 2a:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	48 89 df             	mov    %rbx,%rdi
  33:	e8 b8 15 db ff       	callq  0xffdb15f0
  38:	4c 8b 23             	mov    (%rbx),%r12
  3b:	49 83 c4 48          	add    $0x48,%r12
  3f:	4c                   	rex.WR

Crashes (3):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-smack-root 2021/09/03 17:24 upstream a9c9a6f741cd f62a5829 .config log report syz C general protection fault in __io_arm_poll_handler
ci-upstream-kasan-gce-root 2021/09/05 14:16 upstream 49624efa65ac d236a457 .config log report info general protection fault in __io_arm_poll_handler
ci-upstream-kasan-gce-smack-root 2021/09/03 16:53 upstream a9c9a6f741cd f62a5829 .config log report info general protection fault in __io_arm_poll_handler