syzbot


INFO: task hung in path_openat (3)

Status: auto-closed as invalid on 2020/02/19 20:16
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 1112d, last: 996d
similar bugs (11):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 INFO: task hung in path_openat 2 1065d 1098d 0/1 auto-closed as invalid on 2020/01/11 07:40
upstream INFO: task hung in path_openat (4) 1 836d 836d 0/23 auto-closed as invalid on 2020/07/28 10:23
linux-4.19 INFO: task hung in path_openat (2) 1 265d 265d 0/1 auto-closed as invalid on 2022/03/21 04:47
linux-4.14 INFO: task hung in path_openat 1 506d 506d 0/1 auto-closed as invalid on 2021/07/23 23:26
android-49 INFO: task hung in path_openat 64 1236d 1217d 0/3 auto-closed as invalid on 2019/09/22 08:41
upstream INFO: task hung in path_openat (5) 23 477d 638d 0/23 auto-closed as invalid on 2021/07/22 20:44
linux-4.19 INFO: task hung in path_openat (3) 1 2d14h 2d14h 0/1 upstream: reported on 2022/08/11 13:14
upstream INFO: task hung in path_openat (6) 13 212d 362d 0/23 closed as invalid on 2022/02/07 19:19
android-414 INFO: task hung in path_openat 42 1140d 1219d 0/1 auto-closed as invalid on 2019/10/28 21:04
upstream INFO: task hung in path_openat 246 1304d 1594d 0/23 closed as dup on 2018/09/08 15:37
upstream INFO: task hung in path_openat (2) 1 1207d 1207d 0/23 closed as invalid on 2019/05/08 13:05

Sample crash report:
INFO: task syz-executor.5:22751 blocked for more than 143 seconds.
      Not tainted 5.3.0-rc6+ #128
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5  D29376 22751   9500 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:3254 [inline]
 __schedule+0x755/0x1580 kernel/sched/core.c:3880
 schedule+0xd9/0x260 kernel/sched/core.c:3947
 rwsem_down_read_slowpath+0x4cc/0xfb0 kernel/locking/rwsem.c:1090
 __down_read kernel/locking/rwsem.c:1320 [inline]
 down_read+0x1f4/0x3f0 kernel/locking/rwsem.c:1463
 inode_lock_shared include/linux/fs.h:788 [inline]
 do_last fs/namei.c:3321 [inline]
 path_openat+0x1e78/0x4630 fs/namei.c:3533
 do_filp_open+0x1a1/0x280 fs/namei.c:3563
 do_open_execat+0x137/0x690 fs/exec.c:857
 __do_execve_file.isra.0+0x170c/0x2340 fs/exec.c:1761
 do_execveat_common fs/exec.c:1868 [inline]
 do_execve fs/exec.c:1885 [inline]
 __do_sys_execve fs/exec.c:1961 [inline]
 __se_sys_execve fs/exec.c:1956 [inline]
 __x64_sys_execve+0x8f/0xc0 fs/exec.c:1956
 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459879
Code: Bad RIP value.
RSP: 002b:00007f1f3692fc78 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459879
RDX: 0000000020000640 RSI: 00000000200002c0 RDI: 0000000020000140
RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1f369306d4
R13: 00000000004bff89 R14: 00000000004d1f30 R15: 00000000ffffffff
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 PID: 1057 Comm: khungtaskd Not tainted 5.3.0-rc6+ #128
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline]
 watchdog+0x9d0/0xef0 kernel/hung_task.c:289
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60

Crashes (4):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-root 2019/08/31 18:51 upstream 6525771f58cb fd37b39e .config log report
ci-upstream-kasan-gce-smack-root 2019/08/02 15:43 upstream 1e78030e5e5b 835dffe7 .config log report
ci-upstream-kasan-gce-root 2019/07/28 11:06 upstream 5168afe6ef59 c85e1c5b .config log report
ci-upstream-linux-next-kasan-gce-root 2019/11/21 20:11 linux-next 1fef9976397f 8098ea0f .config log report