syzbot


BUG: unable to handle kernel paging request in find_lock_lowest_rq

Status: upstream: reported on 2024/07/31 23:30
Subsystems: kernel
[Documentation on labels]
Reported-by: syzbot+54ac85e4189aac460540@syzkaller.appspotmail.com
First crash: 168d, last: 2d05h
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [kernel?] BUG: unable to handle kernel paging request in find_lock_lowest_rq 0 (1) 2024/07/31 23:30
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING: locking bug in find_lock_lowest_rq ext4 C error 53 1d09h 210d 0/28 upstream: reported C repro on 2024/04/25 01:07

Sample crash report:
BUG: unable to handle page fault for address: fffffbfff3e139a3
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 23ffe4067 P4D 23ffe4067 PUD 23ffe3067 PMD 0 
Oops: Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 11978 Comm: syz.2.1592 Not tainted 6.11.0-rc5-syzkaller-00079-g928f79a188aa #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:87 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:104 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:161 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x82/0x290 mm/kasan/generic.c:189
Code: 01 00 00 00 00 fc ff df 4f 8d 3c 31 4c 89 fd 4c 29 dd 48 83 fd 10 7f 29 48 85 ed 0f 84 3e 01 00 00 4c 89 cd 48 f7 d5 48 01 dd <41> 80 3b 00 0f 85 c9 01 00 00 49 ff c3 48 ff c5 75 ee e9 1e 01 00
RSP: 0018:ffffc90004cff820 EFLAGS: 00010086
RAX: 000000000172d001 RBX: 1ffffffff3e139a3 RCX: ffffffff816fdeeb
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff9f09cd18
RBP: ffffffffffffffff R08: ffffffff9f09cd1f R09: 1ffffffff3e139a3
R10: dffffc0000000000 R11: fffffbfff3e139a3 R12: ffff888027661e00
R13: ffff8880276628d8 R14: dffffc0000000001 R15: fffffbfff3e139a4
FS:  000055558306a500(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffbfff3e139a3 CR3: 000000002cf24000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 __lock_acquire+0xc8b/0x2040 kernel/locking/lockdep.c:5112
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
 _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
 raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:560
 _double_lock_balance kernel/sched/sched.h:2760 [inline]
 double_lock_balance kernel/sched/sched.h:2805 [inline]
 find_lock_lowest_rq+0x1e1/0x670 kernel/sched/rt.c:1941
 push_rt_task+0x13f/0x7e0 kernel/sched/rt.c:2074
 push_rt_tasks kernel/sched/rt.c:2124 [inline]
 task_woken_rt+0x14c/0x220 kernel/sched/rt.c:2424
 ttwu_do_activate+0x338/0x7e0 kernel/sched/core.c:3594
 ttwu_queue kernel/sched/core.c:3846 [inline]
 try_to_wake_up+0x884/0x1470 kernel/sched/core.c:4167
 signal_wake_up_state+0xb4/0x120 kernel/signal.c:773
 signal_wake_up include/linux/sched/signal.h:448 [inline]
 zap_other_threads+0x2fd/0x3e0 kernel/signal.c:1384
 do_group_exit+0x18a/0x2c0 kernel/exit.c:1026
 __do_sys_exit_group kernel/exit.c:1042 [inline]
 __se_sys_exit_group kernel/exit.c:1040 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1040
 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc52f779ef9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff643cdd08 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc52f779ef9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fff643cdd5c R08: 00007fff643cddef R09: 000000000008b902
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000032
R13: 000000000008b902 R14: 000000000008b5af R15: 00007fff643cddb0
 </TASK>
Modules linked in:
CR2: fffffbfff3e139a3
---[ end trace 0000000000000000 ]---
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:87 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:104 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:161 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x82/0x290 mm/kasan/generic.c:189
Code: 01 00 00 00 00 fc ff df 4f 8d 3c 31 4c 89 fd 4c 29 dd 48 83 fd 10 7f 29 48 85 ed 0f 84 3e 01 00 00 4c 89 cd 48 f7 d5 48 01 dd <41> 80 3b 00 0f 85 c9 01 00 00 49 ff c3 48 ff c5 75 ee e9 1e 01 00
RSP: 0018:ffffc90004cff820 EFLAGS: 00010086
RAX: 000000000172d001 RBX: 1ffffffff3e139a3 RCX: ffffffff816fdeeb
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff9f09cd18
RBP: ffffffffffffffff R08: ffffffff9f09cd1f R09: 1ffffffff3e139a3
R10: dffffc0000000000 R11: fffffbfff3e139a3 R12: ffff888027661e00
R13: ffff8880276628d8 R14: dffffc0000000001 R15: fffffbfff3e139a4
FS:  000055558306a500(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffbfff3e139a3 CR3: 000000002cf24000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess), 7 bytes skipped:
   0:	df 4f 8d             	fisttps -0x73(%rdi)
   3:	3c 31                	cmp    $0x31,%al
   5:	4c 89 fd             	mov    %r15,%rbp
   8:	4c 29 dd             	sub    %r11,%rbp
   b:	48 83 fd 10          	cmp    $0x10,%rbp
   f:	7f 29                	jg     0x3a
  11:	48 85 ed             	test   %rbp,%rbp
  14:	0f 84 3e 01 00 00    	je     0x158
  1a:	4c 89 cd             	mov    %r9,%rbp
  1d:	48 f7 d5             	not    %rbp
  20:	48 01 dd             	add    %rbx,%rbp
* 23:	41 80 3b 00          	cmpb   $0x0,(%r11) <-- trapping instruction
  27:	0f 85 c9 01 00 00    	jne    0x1f6
  2d:	49 ff c3             	inc    %r11
  30:	48 ff c5             	inc    %rbp
  33:	75 ee                	jne    0x23
  35:	e9                   	.byte 0xe9
  36:	1e                   	(bad)
  37:	01 00                	add    %eax,(%rax)

Crashes (12):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/08/29 12:39 upstream 928f79a188aa ef3de9e8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root BUG: unable to handle kernel paging request in find_lock_lowest_rq
2024/07/31 08:29 upstream 22f546873149 6fde257d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root BUG: unable to handle kernel paging request in find_lock_lowest_rq
2024/07/18 09:12 upstream b1bc554e009e 03114f55 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root BUG: unable to handle kernel paging request in find_lock_lowest_rq
2024/06/30 02:14 upstream 8282d5af7be8 757f06b1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root BUG: unable to handle kernel paging request in find_lock_lowest_rq
2024/06/06 00:45 upstream 71d7b52cc33b 121701b6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root BUG: unable to handle kernel paging request in find_lock_lowest_rq
2024/11/19 01:19 upstream adc218676eef 571351cb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: wild-memory-access Read in find_lock_lowest_rq
2024/11/15 13:42 upstream cfaaa7d010d1 f6ede3a3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: wild-memory-access Read in find_lock_lowest_rq
2024/11/12 10:58 upstream 2d5404caa8c7 75bb1b32 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: wild-memory-access Read in find_lock_lowest_rq
2024/11/07 04:09 upstream 7758b206117d df3dc63b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: wild-memory-access Read in find_lock_lowest_rq
2024/11/06 18:33 upstream 2e1b3cc9d7f7 3a465482 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: wild-memory-access Read in find_lock_lowest_rq
2024/08/17 14:25 upstream e5fa841af679 dbc93b08 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: wild-memory-access Read in find_lock_lowest_rq
2024/07/31 23:29 upstream e4fc196f5ba3 1e9c4cf3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: wild-memory-access Read in find_lock_lowest_rq
* Struck through repros no longer work on HEAD.