syzbot


BUG: unable to handle kernel paging request in eventfd_signal

Status: upstream: reported syz repro on 2022/03/06 00:26
Reported-by: syzbot+4b28a05ce932c6152ad1@syzkaller.appspotmail.com
First crash: 278d, last: 278d

Sample crash report:
BUG: unable to handle page fault for address: fffffc0000000000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 430 Comm: io_uring-sq Not tainted 5.4.161-syzkaller-00026-g8a3679a75730 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:91 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:108 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:134 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:165 [inline]
RIP: 0010:check_memory_region_inline mm/kasan/generic.c:181 [inline]
RIP: 0010:check_memory_region+0x70/0x2e0 mm/kasan/generic.c:191
Code: bd 01 00 00 00 00 fc ff df 4d 01 ea 4d 89 d6 4d 29 ce 49 83 fe 10 7f 2c 4d 85 f6 0f 84 aa 01 00 00 4c 89 cb 4c 29 d3 0f 1f 00 <45> 0f b6 19 45 84 db 0f 85 f3 01 00 00 49 ff c1 48 ff c3 75 eb e9
RSP: 0018:ffff8881e866fc30 EFLAGS: 00010006
RAX: 1ffff1103ebf8b01 RBX: 1fffffffffffffff RCX: ffffffff8424284d
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffffffffffff
RBP: 1ffff1103d0cdf8c R08: dffffc0000000000 R09: fffffc0000000000
R10: dffffc0000000001 R11: 0000000000000000 R12: 1fffffffffffffff
R13: dffffc0000000001 R14: e000000000000002 R15: ffff8881e866fc60
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffc0000000000 CR3: 00000001ea48a000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 atomic_try_cmpxchg include/asm-generic/atomic-instrumented.h:693 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:78 [inline]
 do_raw_spin_lock_flags include/linux/spinlock.h:193 [inline]
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:119 [inline]
 _raw_spin_lock_irqsave+0x8d/0x190 kernel/locking/spinlock.c:159
 eventfd_signal+0x49/0x130 fs/eventfd.c:76
 io_submit_sqes fs/io_uring.c:2776 [inline]
 io_sq_thread+0xc66/0x1990 fs/io_uring.c:2902
 kthread+0x30f/0x330 kernel/kthread.c:288
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
CR2: fffffc0000000000
---[ end trace 068da0eab51aac91 ]---
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:91 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:108 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:134 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:165 [inline]
RIP: 0010:check_memory_region_inline mm/kasan/generic.c:181 [inline]
RIP: 0010:check_memory_region+0x70/0x2e0 mm/kasan/generic.c:191
Code: bd 01 00 00 00 00 fc ff df 4d 01 ea 4d 89 d6 4d 29 ce 49 83 fe 10 7f 2c 4d 85 f6 0f 84 aa 01 00 00 4c 89 cb 4c 29 d3 0f 1f 00 <45> 0f b6 19 45 84 db 0f 85 f3 01 00 00 49 ff c1 48 ff c3 75 eb e9
RSP: 0018:ffff8881e866fc30 EFLAGS: 00010006
RAX: 1ffff1103ebf8b01 RBX: 1fffffffffffffff RCX: ffffffff8424284d
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffffffffffff
RBP: 1ffff1103d0cdf8c R08: dffffc0000000000 R09: fffffc0000000000
R10: dffffc0000000001 R11: 0000000000000000 R12: 1fffffffffffffff
R13: dffffc0000000001 R14: e000000000000002 R15: ffff8881e866fc60
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffc0000000000 CR3: 00000001ea48a000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	bd 01 00 00 00       	mov    $0x1,%ebp
   5:	00 fc                	add    %bh,%ah
   7:	ff                   	(bad)
   8:	df 4d 01             	fisttps 0x1(%rbp)
   b:	ea                   	(bad)
   c:	4d 89 d6             	mov    %r10,%r14
   f:	4d 29 ce             	sub    %r9,%r14
  12:	49 83 fe 10          	cmp    $0x10,%r14
  16:	7f 2c                	jg     0x44
  18:	4d 85 f6             	test   %r14,%r14
  1b:	0f 84 aa 01 00 00    	je     0x1cb
  21:	4c 89 cb             	mov    %r9,%rbx
  24:	4c 29 d3             	sub    %r10,%rbx
  27:	0f 1f 00             	nopl   (%rax)
* 2a:	45 0f b6 19          	movzbl (%r9),%r11d <-- trapping instruction
  2e:	45 84 db             	test   %r11b,%r11b
  31:	0f 85 f3 01 00 00    	jne    0x22a
  37:	49 ff c1             	inc    %r9
  3a:	48 ff c3             	inc    %rbx
  3d:	75 eb                	jne    0x2a
  3f:	e9                   	.byte 0xe9

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-android-5-4-kasan 2022/03/06 00:36 android12-5.4 8a3679a75730 7bdd8b2c .config log report syz BUG: unable to handle kernel paging request in eventfd_signal
ci2-android-5-4-kasan 2022/03/06 00:25 android12-5.4 8a3679a75730 7bdd8b2c .config log report info BUG: unable to handle kernel paging request in eventfd_signal
* Struck through repros no longer work on HEAD.