syzbot


BUG: unable to handle kernel paging request in swake_up_locked (2)

Status: upstream: reported C repro on 2026/02/06 04:49
Reported-by: syzbot+47d1799dedf1a27ab54a@syzkaller.appspotmail.com
First crash: 19h55m, last: 14h11m
Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-15 BUG: unable to handle kernel paging request in swake_up_locked origin:lts 8 syz 1 607d 607d 0/2 auto-obsoleted due to no activity on 2024/09/07 02:36
android-5-10 BUG: unable to handle kernel paging request in swake_up_locked (2) 8 C 10 17d 188d 0/2 upstream: reported C repro on 2025/08/02 08:30
android-5-10 BUG: unable to handle kernel paging request in swake_up_locked 8 C inconclusive 1 610d 642d 0/2 auto-obsoleted due to no activity on 2024/09/14 06:17
upstream KMSAN: uninit-value in swake_up_locked kernel 7 2 1628d 1638d 0/29 auto-closed as invalid on 2021/11/21 11:48

Sample crash report:
input: syz1 as /devices/virtual/input/input110
BUG: unable to handle page fault for address: fffffffffffffff8
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 6612067 P4D 6612067 PUD 6614067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 723 Comm: syz.3.123 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:swake_up_locked+0x57/0x120 kernel/sched/swait.c:30
Code: 89 f7 e8 5c 2c 5b 00 49 8b 1e 4c 39 f3 0f 84 ca 00 00 00 48 8d 7b f8 48 89 f8 48 c1 e8 03 42 80 3c 20 00 74 05 e8 39 2c 5b 00 <48> 8b 7b f8 e8 50 10 fa ff 48 89 df e8 98 83 06 01 84 c0 74 6a 48
RSP: 0018:ffffc90001e9fce0 EFLAGS: 00010046
RAX: 1fffffffffffffff RBX: 0000000000000000 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: 0000000000000004 RDI: fffffffffffffff8
RBP: ffffc90001e9fd08 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520003d3f90 R12: dffffc0000000000
R13: 1ffff920003ccf4e R14: ffffc90001e67a80 R15: ffffc90001e67a70
FS:  00007fb4916066c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffff8 CR3: 000000012f66c000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 complete+0x5e/0xb0 kernel/sched/completion.c:36
 uinput_flush_requests drivers/input/misc/uinput.c:213 [inline]
 uinput_destroy_device+0x129/0x8e0 drivers/input/misc/uinput.c:298
 uinput_release+0x3e/0x50 drivers/input/misc/uinput.c:758
 __fput+0x20b/0x8b0 fs/file_table.c:311
 ____fput+0x15/0x20 fs/file_table.c:339
 task_work_run+0x127/0x190 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fb4917a1eb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb491606028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007fb491a1cfa0 RCX: 00007fb4917a1eb9
RDX: 0000000000000000 RSI: 0000000000005501 RDI: 0000000000000004
RBP: 00007fb49180fc1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb491a1d038 R14: 00007fb491a1cfa0 R15: 00007ffeffba46c8
 </TASK>
Modules linked in:
CR2: fffffffffffffff8
---[ end trace fe0d2b41e74636af ]---
RIP: 0010:swake_up_locked+0x57/0x120 kernel/sched/swait.c:30
Code: 89 f7 e8 5c 2c 5b 00 49 8b 1e 4c 39 f3 0f 84 ca 00 00 00 48 8d 7b f8 48 89 f8 48 c1 e8 03 42 80 3c 20 00 74 05 e8 39 2c 5b 00 <48> 8b 7b f8 e8 50 10 fa ff 48 89 df e8 98 83 06 01 84 c0 74 6a 48
RSP: 0018:ffffc90001e9fce0 EFLAGS: 00010046
RAX: 1fffffffffffffff RBX: 0000000000000000 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: 0000000000000004 RDI: fffffffffffffff8
RBP: ffffc90001e9fd08 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520003d3f90 R12: dffffc0000000000
R13: 1ffff920003ccf4e R14: ffffc90001e67a80 R15: ffffc90001e67a70
FS:  00007fb4916066c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffff8 CR3: 000000012f66c000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	89 f7                	mov    %esi,%edi
   2:	e8 5c 2c 5b 00       	call   0x5b2c63
   7:	49 8b 1e             	mov    (%r14),%rbx
   a:	4c 39 f3             	cmp    %r14,%rbx
   d:	0f 84 ca 00 00 00    	je     0xdd
  13:	48 8d 7b f8          	lea    -0x8(%rbx),%rdi
  17:	48 89 f8             	mov    %rdi,%rax
  1a:	48 c1 e8 03          	shr    $0x3,%rax
  1e:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
  23:	74 05                	je     0x2a
  25:	e8 39 2c 5b 00       	call   0x5b2c63
* 2a:	48 8b 7b f8          	mov    -0x8(%rbx),%rdi <-- trapping instruction
  2e:	e8 50 10 fa ff       	call   0xfffa1083
  33:	48 89 df             	mov    %rbx,%rdi
  36:	e8 98 83 06 01       	call   0x10683d3
  3b:	84 c0                	test   %al,%al
  3d:	74 6a                	je     0xa9
  3f:	48                   	rex.W

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/02/06 06:14 android13-5.15-lts 4115628a19d7 f03c4191 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: unable to handle kernel paging request in swake_up_locked
2026/02/06 04:49 android13-5.15-lts 4115628a19d7 f03c4191 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-5-15 BUG: unable to handle kernel paging request in swake_up_locked
2026/02/06 10:32 android13-5.15-lts 4115628a19d7 f03c4191 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-5-15 BUG: unable to handle kernel paging request in swake_up_locked
* Struck through repros no longer work on HEAD.