syzbot


INFO: rcu detected stall in do_page_fault (2)

Status: auto-closed as invalid on 2022/07/31 14:50
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 214d, last: 214d
similar bugs (1):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in do_page_fault 3 1349d 1447d 0/24 auto-closed as invalid on 2019/09/21 14:08

Sample crash report:
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P2234/1:b..l
	(detected by 1, t=30006 jiffies, g=561173, q=93)
task:syz-executor.0  state:R  running task     stack:    0 pid: 2234 ppid:  2232 flags:0x00000000
Backtrace: 
[<816f8160>] (__schedule) from [<816f9228>] (preempt_schedule_irq+0x40/0xd0 kernel/sched/core.c:6696)
 r10:00000255 r9:838c4680 r8:80200b9c r7:df981e6c r6:ffffffff r5:00000000
 r4:838c4680
[<816f91e8>] (preempt_schedule_irq) from [<80200bb4>] (svc_preempt+0x8/0x18)
Exception stack(0xdf981e38 to 0xdf981e80)
1e20:                                                       00000000 00000006
1e40: 00000007 5bd2c000 838c4680 00109000 00000255 a0000113 846f4750 82ab8c40
1e60: 00000255 df981f2c df981e48 df981e88 816f6984 80428d3c 80000113 ffffffff
 r5:80000113 r4:80428d3c
[<80428cac>] (handle_mm_fault) from [<80216cc0>] (__do_page_fault arch/arm/mm/fault.c:244 [inline])
[<80428cac>] (handle_mm_fault) from [<80216cc0>] (do_page_fault+0x118/0x38c arch/arm/mm/fault.c:313)
 r10:00000255 r9:82ab8c40 r8:82ab8c00 r7:838c4680 r6:00000a0f r5:00109ccc
 r4:df981fb0
[<80216ba8>] (do_page_fault) from [<8021711c>] (do_DataAbort+0x38/0xa8 arch/arm/mm/fault.c:539)
 r10:7ef82e90 r9:0010be10 r8:80216ba8 r7:df981fb0 r6:00109ccc r5:00000a0f
 r4:8221ce18
[<802170e4>] (do_DataAbort) from [<80200e58>] (__dabt_usr+0x58/0x60 arch/arm/kernel/entry-armv.S:441)
Exception stack(0xdf981fb0 to 0xdf981ff8)
1fa0:                                     00085dc8 000a4948 00000002 00000004
1fc0: 00109c78 7ef82e94 7ef82ee8 00000003 00000000 0010be10 7ef82e90 00109c20
1fe0: 000002d8 7ef82e80 00015c50 00015c5c 60000010 ffffffff
 r8:820a0044 r7:838c4680 r6:ffffffff r5:60000010 r4:00015c5c

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-qemu2-arm32 2022/05/02 14:49 upstream 672c0c517342 2df221f6 .config log report info INFO: rcu detected stall in do_page_fault
* Struck through repros no longer work on HEAD.