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INFO: task hung in rwsem_down_read_failed

Status: public: reported C repro on 2019/04/13 00:00
Reported-by: syzbot+96832b259ab02bab18ef@syzkaller.appspotmail.com
First crash: 2541d, last: 2514d
▶ ▼ Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-44 INFO: task hung in rwsem_down_read_failed C 10 2512d 2049d 0/2 public: reported C repro on 2019/04/13 00:00
upstream INFO: task hung in rwsem_down_read_failed perf 8 2483d 2530d 0/28 closed as invalid on 2018/02/14 14:55

Sample crash report:
INFO: task kworker/u4:0:6 blocked for more than 120 seconds.
      Not tainted 4.9.71-g2506378 #113
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u4:0    D26384     6      2 0x00000000
Workqueue: events_unbound flush_to_ldisc
 ffff8801da290000 ffff8801c50d7480 ffff8801c50d7480 ffff8801c3b70000
 ffff8801db221458 ffff8801da29f850 ffffffff8389e00b ffff8801da29f828
 ffffffff8123940f 00ffffff838a997a ffff8801db221d28 ffff8801db221d50
Call Trace:
 [<ffffffff8389f5af>] schedule+0x7f/0x1b0 kernel/sched/core.c:3550
 [<ffffffff838a9a90>] rwsem_down_read_failed+0x1e0/0x320 kernel/locking/rwsem-xadd.c:260
 [<ffffffff81dc5448>] call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 [<ffffffff838a8812>] __down_read arch/x86/include/asm/rwsem.h:65 [inline]
 [<ffffffff838a8812>] down_read+0x52/0xb0 kernel/locking/rwsem.c:24

Crashes (42):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2017/12/22 13:55 https://android.googlesource.com/kernel/common android-4.9 250637879165 81fe66b4 .config console log report syz C ci-android-49-kasan-gce
2018/01/02 19:13 https://android.googlesource.com/kernel/common android-4.9 f3f3457d4582 00193447 .config console log report ci-android-49-kasan-gce
2018/01/01 11:22 https://android.googlesource.com/kernel/common android-4.9 f3f3457d4582 00193447 .config console log report ci-android-49-kasan-gce
2017/12/31 09:42 https://android.googlesource.com/kernel/common android-4.9 f3f3457d4582 bb6384b8 .config console log report ci-android-49-kasan-gce-386
2017/12/30 15:00 https://android.googlesource.com/kernel/common android-4.9 f3f3457d4582 bb6384b8 .config console log report ci-android-49-kasan-gce
2017/12/30 06:44 https://android.googlesource.com/kernel/common android-4.9 f3f3457d4582 bb6384b8 .config console log report ci-android-49-kasan-gce
2017/12/30 01:09 https://android.googlesource.com/kernel/common android-4.9 f3f3457d4582 bb6384b8 .config console log report ci-android-49-kasan-gce
2017/12/29 20:10 https://android.googlesource.com/kernel/common android-4.9 f3f3457d4582 7d240098 .config console log report ci-android-49-kasan-gce
2017/12/28 19:04 https://android.googlesource.com/kernel/common android-4.9 cb7518e6167c 7d240098 .config console log report ci-android-49-kasan-gce
2017/12/28 11:33 https://android.googlesource.com/kernel/common android-4.9 cb7518e6167c 7d240098 .config console log report ci-android-49-kasan-gce-386
2017/12/28 10:10 https://android.googlesource.com/kernel/common android-4.9 cb7518e6167c 7d240098 .config console log report ci-android-49-kasan-gce
2017/12/27 17:55 https://android.googlesource.com/kernel/common android-4.9 cb7518e6167c 09c8f4c0 .config console log report ci-android-49-kasan-gce-386
2017/12/27 16:13 https://android.googlesource.com/kernel/common android-4.9 cb7518e6167c 09c8f4c0 .config console log report ci-android-49-kasan-gce
2017/12/25 12:46 https://android.googlesource.com/kernel/common android-4.9 250637879165 73aba437 .config console log report ci-android-49-kasan-gce
2017/12/23 18:06 https://android.googlesource.com/kernel/common android-4.9 250637879165 73aba437 .config console log report ci-android-49-kasan-gce
2017/12/23 14:49 https://android.googlesource.com/kernel/common android-4.9 250637879165 73aba437 .config console log report ci-android-49-kasan-gce
2017/12/22 08:49 https://android.googlesource.com/kernel/common android-4.9 250637879165 81fe66b4 .config console log report ci-android-49-kasan-gce
2017/12/20 20:54 https://android.googlesource.com/kernel/common android-4.9 319c8e1bc7a1 90a46995 .config console log report ci-android-49-kasan-gce
2017/12/20 13:43 https://android.googlesource.com/kernel/common android-4.9 319c8e1bc7a1 90a46995 .config console log report ci-android-49-kasan-gce
2017/12/20 09:13 https://android.googlesource.com/kernel/common android-4.9 c14c7b37e933 2d836b1d .config console log report ci-android-49-kasan-gce
2017/12/20 07:41 https://android.googlesource.com/kernel/common android-4.9 c14c7b37e933 2d836b1d .config console log report ci-android-49-kasan-gce
2017/12/20 07:17 https://android.googlesource.com/kernel/common android-4.9 c14c7b37e933 2d836b1d .config console log report ci-android-49-kasan-gce
2017/12/19 20:12 https://android.googlesource.com/kernel/common android-4.9 c14c7b37e933 af9163c7 .config console log report ci-android-49-kasan-gce-386
2017/12/18 22:12 https://android.googlesource.com/kernel/common android-4.9 9542d2a0126e 1c4160ef .config console log report ci-android-49-kasan-gce
2017/12/18 19:43 https://android.googlesource.com/kernel/common android-4.9 9542d2a0126e 1c4160ef .config console log report ci-android-49-kasan-gce
2017/12/18 16:11 https://android.googlesource.com/kernel/common android-4.9 9542d2a0126e 1c4160ef .config console log report ci-android-49-kasan-gce-386
2017/12/18 14:22 https://android.googlesource.com/kernel/common android-4.9 9542d2a0126e 1c4160ef .config console log report ci-android-49-kasan-gce
2017/12/17 04:59 https://android.googlesource.com/kernel/common android-4.9 3f1d77ca5f8f b6f0c91b .config console log report ci-android-49-kasan-gce-386
2017/12/17 00:55 https://android.googlesource.com/kernel/common android-4.9 3f1d77ca5f8f b6f0c91b .config console log report ci-android-49-kasan-gce
2017/12/16 15:01 https://android.googlesource.com/kernel/common android-4.9 3f1d77ca5f8f b6f0c91b .config console log report ci-android-49-kasan-gce
2017/12/15 20:40 https://android.googlesource.com/kernel/common android-4.9 3f1d77ca5f8f ac20b98c .config console log report ci-android-49-kasan-gce
2017/12/13 08:11 https://android.googlesource.com/kernel/common android-4.9 fb66dc2a6e5e ce7f2399 .config console log report ci-android-49-kasan-gce
2017/12/13 07:47 https://android.googlesource.com/kernel/common android-4.9 fb66dc2a6e5e ce7f2399 .config console log report ci-android-49-kasan-gce
2017/12/13 06:15 https://android.googlesource.com/kernel/common android-4.9 fb66dc2a6e5e ce7f2399 .config console log report ci-android-49-kasan-gce
2017/12/12 15:01 https://android.googlesource.com/kernel/common android-4.9 fb66dc2a6e5e 414a185f .config console log report ci-android-49-kasan-gce-386
2017/12/12 13:39 https://android.googlesource.com/kernel/common android-4.9 fb66dc2a6e5e 32f694fc .config console log report ci-android-49-kasan-gce
2017/12/12 03:58 https://android.googlesource.com/kernel/common android-4.9 fb66dc2a6e5e da131727 .config console log report ci-android-49-kasan-gce
2017/12/11 14:59 https://android.googlesource.com/kernel/common android-4.9 f26d3c76d376 27f5dfef .config console log report ci-android-49-kasan-gce-386
2017/12/10 18:39 https://android.googlesource.com/kernel/common android-4.9 f26d3c76d376 5ad0ce95 .config console log report ci-android-49-kasan-gce
2017/12/10 15:07 https://android.googlesource.com/kernel/common android-4.9 f26d3c76d376 5ad0ce95 .config console log report ci-android-49-kasan-gce
2017/12/09 19:44 https://android.googlesource.com/kernel/common android-4.9 f26d3c76d376 5ad0ce95 .config console log report ci-android-49-kasan-gce
* Struck through repros no longer work on HEAD.