INFO: task hung in evdev_flush

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 666c420f FROMLIST: ANDROID: binder: Add BINDER_GET_NODE_IN..
git tree: android-4.14
console output: https://syzkaller.appspot.com/x/log.txt?x=1127512a400000
kernel config: https://syzkaller.appspot.com/x/.config?x=89d929f317ea847c
dashboard link: https://syzkaller.appspot.com/bug?extid=58a0b0d5e452ed58c445
compiler: gcc (GCC) 8.0.1 20180413 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+58a0b0...@syzkaller.appspotmail.com

INFO: task syz-executor2:14202 blocked for more than 140 seconds.
Not tainted 4.14.71+ #8
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor2 D28424 14202 1847 0x00000004
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
evdev_flush+0x6d/0x120 drivers/input/evdev.c:350
filp_close+0x9f/0x130 fs/open.c:1148
__close_fd+0x14a/0x220 fs/file.c:638
SYSC_close fs/open.c:1167 [inline]
SyS_close+0x46/0x80 fs/open.c:1165
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x411151
RSP: 002b:00007fffb0e73210 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000411151
RDX: 0000000000000000 RSI: 0000000000730bf0 RDI: 0000000000000004
RBP: 0000000000000000 R08: 00000000000000a0 R09: ffffffffffffffff
R10: 000000000072bfa0 R11: 0000000000000293 R12: 000000000000000c
R13: 00000000000739c8 R14: 0000000000000139 R15: badc0ffeebadface

Showing all locks held in the system:
1 lock held by khungtaskd/23:
#0: (tasklist_lock){.+.?}, at: [<ffffffffa6e01e67>]
debug_show_all_locks+0x74/0x20f kernel/locking/lockdep.c:4541
2 locks held by getty/1761:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffffa79245e0>]
tty_ldisc_ref_wait+0x20/0x80 drivers/tty/tty_ldisc.c:275
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffffa791fb5f>]
n_tty_read+0x1ff/0x15e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor2/14202:
#0: (&evdev->mutex){+.+.}, at: [<ffffffffa7c34dfd>]
evdev_flush+0x6d/0x120 drivers/input/evdev.c:350

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 23 Comm: khungtaskd Not tainted 4.14.71+ #8
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0xb9/0x11b lib/dump_stack.c:53
nmi_cpu_backtrace.cold.0+0x47/0x85 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x121/0x146 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline]
watchdog+0x574/0xa70 kernel/hung_task.c:252
kthread+0x348/0x420 kernel/kthread.c:232
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 6252 Comm: syz-executor5 Not tainted 4.14.71+ #8
task: ffff8801c8a6c680 task.stack: ffff8801a1080000
RIP: 0010:__sanitizer_cov_trace_pc+0x1d/0x60 kernel/kcov.c:65
RSP: 0018:ffff8801a10879a8 EFLAGS: 00000246
RAX: ffff8801c8a6c680 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 1ffff10034210f63 RDI: ffffc90000046039
RBP: ffff8801a1087ae0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffffa8a95960
R13: 1ffff10034210f3d R14: ffffed0034210f62 R15: ffffc90000046040
FS: 00007f2bc2445700(0000) GS:ffff8801dba00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000206f7000 CR3: 00000001c43fe004 CR4: 00000000001606b0
DR0: 00000000200001c0 DR1: 00000000200001c0 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
___bpf_prog_run+0x91/0x5c70 kernel/bpf/core.c:885
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 65 48 8b 04 25 c0 de 01 00
48 85 c0 74 1a 65 8b 15 2b 25 11 59 81 e2 00 01 1f 00 75 0b <8b> 90 a8 11
00 00 83 fa 01 74 01 c3 48 c7 c2 00 00 00 81 48 81


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

[syzbot]

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: b2cf10ee ANDROID: arm64: mm: fix 4.4.154 merge
git tree: android-4.4
console output: https://syzkaller.appspot.com/x/log.txt?x=16404fa9400000
kernel config: https://syzkaller.appspot.com/x/.config?x=7e912d922815a1c1
dashboard link: https://syzkaller.appspot.com/bug?extid=a3a90f83a5aea38396a1

compiler: gcc (GCC) 8.0.1 20180413 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:

Reported-by: syzbot+a3a90f...@syzkaller.appspotmail.com

INFO: task syz-executor6:5758 blocked for more than 140 seconds.
Not tainted 4.4.154+ #96

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

syz-executor6 D ffff8801d536f858 28768 5758 2363 0x00000000
ffff8801d536f858 0000000000000000 ffff8801c7df88c8 ffffed0038fbf118
ffff8801c7df8000 ffff8801db61f180 ffff8801db61f1a8 ffff8801db61e898
ffff8801db61e880 ffff8800a40317c0 ffff8801c7df8000 0000000000000000
Call Trace:
[<ffffffff82683b5a>] schedule+0x7a/0x1b0 kernel/sched/core.c:3355
[<ffffffff826842f3>] schedule_preempt_disabled+0x13/0x20
kernel/sched/core.c:3388
[<ffffffff82686017>] __mutex_lock_common kernel/locking/mutex.c:582
[inline]
[<ffffffff82686017>] mutex_lock_nested+0x307/0x840
kernel/locking/mutex.c:621
[<ffffffff81f22582>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350
[<ffffffff8146e1a7>] filp_close+0xa7/0x140 fs/open.c:1095
[<ffffffff814cca7a>] close_files fs/file.c:405 [inline]
[<ffffffff814cca7a>] put_files_struct+0x15a/0x270 fs/file.c:433
[<ffffffff814cccb3>] exit_files+0x83/0xb0 fs/file.c:462
[<ffffffff810d6516>] do_exit+0x986/0x2640 kernel/exit.c:750
[<ffffffff810dc431>] do_group_exit+0x111/0x300 kernel/exit.c:885
[<ffffffff810fd49c>] get_signal+0x4ec/0x14a0 kernel/signal.c:2321
[<ffffffff8100bc65>] do_signal+0x95/0x1840 arch/x86/kernel/signal.c:712
[<ffffffff81003eba>] exit_to_usermode_loop+0x11a/0x160
arch/x86/entry/common.c:249
[<ffffffff810057a5>] prepare_exit_to_usermode arch/x86/entry/common.c:284
[inline]
[<ffffffff810057a5>] syscall_return_slowpath+0x1b5/0x1f0
arch/x86/entry/common.c:349
[<ffffffff826906ad>] int_ret_from_sys_call+0x25/0xa3
1 lock held by syz-executor6/5758:
#0: (&evdev->mutex){+.+.+.}, at: [<ffffffff81f22582>]
evdev_flush+0x72/0x120 drivers/input/evdev.c:350
Sending NMI to all CPUs:

NMI backtrace for cpu 0

CPU: 0 PID: 20 Comm: khungtaskd Not tainted 4.4.154+ #96
task: ffff8801d9e94740 task.stack: ffff8800001b8000
RIP: 0010:[<ffffffff8109a2a6>] [<ffffffff8109a2a6>] native_apic_mem_write
arch/x86/include/asm/apic.h:93 [inline]
RIP: 0010:[<ffffffff8109a2a6>] [<ffffffff8109a2a6>]
__default_send_IPI_dest_field arch/x86/include/asm/ipi.h:119 [inline]
RIP: 0010:[<ffffffff8109a2a6>] [<ffffffff8109a2a6>] _flat_send_IPI_mask
arch/x86/kernel/apic/apic_flat_64.c:61 [inline]
RIP: 0010:[<ffffffff8109a2a6>] [<ffffffff8109a2a6>]
flat_send_IPI_mask+0xf6/0x1a0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8800001bfcc8 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fc300
RBP: ffff8800001bfcf0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000246
R13: 0000000003000000 R14: ffffffff82e5f3a0 R15: 0000000000000002
FS: 0000000000000000(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000000020846000 CR3: 00000001ceed5000 CR4: 00000000001606b0
Stack:
ffffffff82e5f3a0 ffffffff831a3060 0000000000000007 fffffbfff06344ec
0000000000000008 ffff8800001bfd10 ffffffff81091931 ffffffff829209a0
0000000000000003 ffff8800001bfd68 ffffffff81a5fa92 ffffffff81391205
Call Trace:
[<ffffffff81091931>] nmi_raise_cpu_backtrace+0x61/0x80
arch/x86/kernel/apic/hw_nmi.c:33
[<ffffffff81a5fa92>] nmi_trigger_all_cpu_backtrace.cold.0+0x70/0xae
lib/nmi_backtrace.c:85
[<ffffffff810919d4>] arch_trigger_all_cpu_backtrace+0x14/0x20
arch/x86/kernel/apic/hw_nmi.c:38
[<ffffffff8139abc7>] trigger_all_cpu_backtrace include/linux/nmi.h:44
[inline]
[<ffffffff8139abc7>] check_hung_task kernel/hung_task.c:125 [inline]
[<ffffffff8139abc7>] check_hung_uninterruptible_tasks
kernel/hung_task.c:182 [inline]
[<ffffffff8139abc7>] watchdog.cold.0+0xd3/0xee kernel/hung_task.c:238
[<ffffffff8112ee98>] kthread+0x268/0x300 kernel/kthread.c:211
[<ffffffff82690905>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:510
Code: 00 c3 5f ff 80 e6 10 75 e1 41 c1 e5 18 44 89 2c 25 10 c3 5f ff 44 89
fa 09 da 80 cf 04 41 83 ff 02 0f 44 d3 89 14 25 00 c3 5f ff <41> f7 c4 00
02 00 00 75 1a 4c 89 e7 57 9d 0f 1f 44 00 00 e8 12

NMI backtrace for cpu 1

CPU: 1 PID: 9758 Comm: syz-executor0 Not tainted 4.4.154+ #96
task: ffff8800a264df00 task.stack: ffff8801bc4b0000
RIP: 0010:[<ffffffff812f8eca>] [<ffffffff812f8eca>] seccomp_run_filters
kernel/seccomp.c:199 [inline]
RIP: 0010:[<ffffffff812f8eca>] [<ffffffff812f8eca>]
__seccomp_phase1_filter kernel/seccomp.c:606 [inline]
RIP: 0010:[<ffffffff812f8eca>] [<ffffffff812f8eca>]
seccomp_phase1+0x17a/0xbf0 kernel/seccomp.c:685
RSP: 0018:ffff8801bc4b7d48 EFLAGS: 00000246
RAX: 1ffff1003b34ebdb RBX: ffff8801d9a75ed0 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff812f8eb4 RDI: ffff8801d9a75ed8
RBP: ffff8801bc4b7e50 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000058fe4
R13: 0000000000050000 R14: ffff8801bc4b7ea0 R15: dffffc0000000000
FS: 00007f9f854ff700(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000000020e2f000 CR3: 00000000b11e6000 CR4: 00000000001606b0
Stack:
1ffff10037896fd0 ffff8801bc4b7f20 ffff8801bc4b7f48 ffffffff810022a7
0000000000000000 0000000000000000 1ffff10037896fb1 000000caa264e7e8
0000000041b58ab3 ffffffff82c441c0 ffffffff812f8d50 0000000000000000
Call Trace:
[<ffffffff81004a98>] syscall_trace_enter_phase1+0x2c8/0x480
arch/x86/entry/common.c:134
[<ffffffff826905bc>] tracesys+0xd/0x44
Code: 00 00 fc ff df 41 bc 00 00 ff 7f eb 2b 41 89 d5 e8 2c ba ff ff 48 8d
7b 08 48 89 f8 48 c1 e8 03 42 80 3c 38 00 0f 85 9f 08 00 00 <48> 8b 5b 08
48 85 db 0f 84 88 01 00 00 e8 04 ba ff ff 48 8d 7b

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 09eb2ba5 ANDROID: x86_64_cuttlefish_defconfig: Enable lz4 ..
git tree: android-4.9
console output: https://syzkaller.appspot.com/x/log.txt?x=17a4aa96400000
kernel config: https://syzkaller.appspot.com/x/.config?x=59246eb7b3f7dd72
dashboard link: https://syzkaller.appspot.com/bug?extid=3e03dfec4c27999bb98f

compiler: gcc (GCC) 8.0.1 20180413 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:

Reported-by: syzbot+3e03df...@syzkaller.appspotmail.com

INFO: task syz-executor1:6811 blocked for more than 140 seconds.
Not tainted 4.9.124-g09eb2ba #83

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

syz-executor1 D29088 6811 3843 0x00000000
ffff8801cf6ac800 ffff8801d8010540 ffff8801d8010540 ffff8801d3a38000
ffff8801db221c18 ffff8801d5ef7cf8 ffffffff839f0afd ffff8801cf6ad0c8
ffffed0039ed5a18 ffff8801cf6ac800 00fffc0000000000 ffff8801db2224e8
Call Trace:
[<ffffffff839f20ff>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
[<ffffffff839f2a83>] schedule_preempt_disabled+0x13/0x20
kernel/sched/core.c:3586
[<ffffffff839f6f06>] __mutex_lock_common kernel/locking/mutex.c:582
[inline]
[<ffffffff839f6f06>] mutex_lock_nested+0x326/0x870
kernel/locking/mutex.c:621
[<ffffffff82b55962>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350
[<ffffffff8156d315>] filp_close+0xa5/0x140 fs/open.c:1129
[<ffffffff815dc396>] __close_fd+0x156/0x230 fs/file.c:651
[<ffffffff8156d3fc>] SYSC_close fs/open.c:1148 [inline]
[<ffffffff8156d3fc>] SyS_close+0x4c/0x90 fs/open.c:1146
[<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
[<ffffffff83a019d3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:

2 locks held by khungtaskd/519:
#0: (rcu_read_lock){......}, at: [<ffffffff813689dc>]
check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
#0: (rcu_read_lock){......}, at: [<ffffffff813689dc>]
watchdog+0x11c/0xa20 kernel/hung_task.c:239
#1: (tasklist_lock){.+.+..}, at: [<ffffffff81428248>]
debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/3666:
#0: (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815dc7ec>]
__fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/3762:
#0: (&tty->ldisc_sem){++++++}, at: [<ffffffff839ffba2>]
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
#1: (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff82125402>]
n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor1/6811:
#0: (&evdev->mutex){+.+...}, at: [<ffffffff82b55962>]
evdev_flush+0x72/0x120 drivers/input/evdev.c:350
1 lock held by syz-executor1/6818:
#0: (&evdev->mutex){+.+...}, at: [<ffffffff82b58542>]
evdev_ioctl_handler+0x112/0x1820 drivers/input/evdev.c:1293
1 lock held by syz-executor1/6873:
#0: (&evdev->mutex){+.+...}, at: [<ffffffff82b575eb>] evdev_open_device
drivers/input/evdev.c:423 [inline]
#0: (&evdev->mutex){+.+...}, at: [<ffffffff82b575eb>]
evdev_open+0x1db/0x430 drivers/input/evdev.c:516
1 lock held by syz-executor1/6900:
#0: (&evdev->mutex){+.+...}, at: [<ffffffff82b58542>]
evdev_ioctl_handler+0x112/0x1820 drivers/input/evdev.c:1293
1 lock held by syz-executor1/6874:
#0: (&evdev->mutex){+.+...}, at: [<ffffffff82b55962>]
evdev_flush+0x72/0x120 drivers/input/evdev.c:350
1 lock held by syz-executor1/6903:
#0: (&evdev->mutex){+.+...}, at: [<ffffffff82b55962>]
evdev_flush+0x72/0x120 drivers/input/evdev.c:350

=============================================

NMI backtrace for cpu 1

CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.124-g09eb2ba #83
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
ffff8801d8637d08 ffffffff81eb95e9 0000000000000000 0000000000000001
0000000000000001 0000000000000001 ffffffff810b9fa0 ffff8801d8637d40
ffffffff81ec4927 0000000000000001 0000000000000000 0000000000000003
Call Trace:
[<ffffffff81eb95e9>] __dump_stack lib/dump_stack.c:15 [inline]
[<ffffffff81eb95e9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
[<ffffffff81ec4927>] nmi_cpu_backtrace.cold.2+0x48/0x87
lib/nmi_backtrace.c:99
[<ffffffff81ec48ba>] nmi_trigger_cpumask_backtrace+0x12a/0x14f
lib/nmi_backtrace.c:60
[<ffffffff810ba0a4>] arch_trigger_cpumask_backtrace+0x14/0x20
arch/x86/kernel/apic/hw_nmi.c:37
[<ffffffff81368f74>] trigger_all_cpu_backtrace include/linux/nmi.h:58
[inline]
[<ffffffff81368f74>] check_hung_task kernel/hung_task.c:125 [inline]
[<ffffffff81368f74>] check_hung_uninterruptible_tasks
kernel/hung_task.c:182 [inline]
[<ffffffff81368f74>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
[<ffffffff8119f3cd>] kthread+0x26d/0x300 kernel/kthread.c:211
[<ffffffff83a01b9c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373

Sending NMI from CPU 1 to CPUs 0:

NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff83a00606

[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.

[syzbot]

[syzbot]