INFO: task hung in snd_seq_do_ioctl
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syzbot
Apr 11, 2019, 8:00:32 PM4/11/19
to syzkaller-a...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: aa856bd8 Merge 4.4.115 into android-4.4
git tree: android-4.4
console output: https://syzkaller.appspot.com/x/log.txt?x=104436b5800000
kernel config: https://syzkaller.appspot.com/x/.config?x=58e89c40ea7f5c9c
dashboard link: https://syzkaller.appspot.com/bug?extid=0798954268ed02d0c566
compiler: gcc (GCC) 7.1.1 20170620
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10a7d0c5800000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14991ab5800000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+079895...@syzkaller.appspotmail.com
INFO: task syzkaller454913:3769 blocked for more than 120 seconds.
Not tainted 4.4.115-gaa856bd #6
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syzkaller454913 D ffff8801d8a27648 27976 3769 3767 0x00000002
ffff8801d8a27648 0000000000000000 0000000000000000 0000000000000000
0000000000000001 ffff8801d8a27600 ffff8801db21fdb8 ffff8801db21fde0
ffff8801db21f4d8 ffffffff84217840 ffff8801d8891800 0000000000000000
Call Trace:
[<ffffffff837662da>] schedule+0x7a/0x1b0 kernel/sched/core.c:3353
[<ffffffff83766ad3>] schedule_preempt_disabled+0x13/0x20
kernel/sched/core.c:3386
[<ffffffff8376b096>] __mutex_lock_common kernel/locking/mutex.c:582
[inline]
[<ffffffff8376b096>] mutex_lock_nested+0x306/0x850
kernel/locking/mutex.c:621
[<ffffffff82d2ad8d>] snd_seq_do_ioctl+0x15d/0x1b0
sound/core/seq/seq_clientmgr.c:2214
[<ffffffff82d2aeb7>] snd_seq_kernel_client_ctl+0xd7/0x150
sound/core/seq/seq_clientmgr.c:2432
[<ffffffff82d54150>] snd_seq_oss_control
sound/core/seq/oss/seq_oss_device.h:157 [inline]
[<ffffffff82d54150>] snd_seq_oss_writeq_clear+0xe0/0x140
sound/core/seq/oss/seq_oss_writeq.c:84
[<ffffffff82d541cf>] snd_seq_oss_writeq_delete+0x1f/0x30
sound/core/seq/oss/seq_oss_writeq.c:68
[<ffffffff82d42d71>] free_devinfo+0x61/0xb0
sound/core/seq/oss/seq_oss_init.c:406
[<ffffffff82d3d015>] port_delete+0xd5/0x110 sound/core/seq/seq_ports.c:273
[<ffffffff82d3d913>] snd_seq_delete_port+0x1c3/0x200
sound/core/seq/seq_ports.c:303
[<ffffffff82d29142>] snd_seq_ioctl_delete_port+0xf2/0x1d0
sound/core/seq/seq_clientmgr.c:1326
[<ffffffff82d2adb2>] snd_seq_do_ioctl+0x182/0x1b0
sound/core/seq/seq_clientmgr.c:2215
[<ffffffff82d2aeb7>] snd_seq_kernel_client_ctl+0xd7/0x150
sound/core/seq/seq_clientmgr.c:2432
[<ffffffff82d3bd5f>] snd_seq_event_port_detach+0xaf/0x100
sound/core/seq/seq_ports.c:706
[<ffffffff82d42e33>] delete_port+0x73/0xb0
sound/core/seq/oss/seq_oss_init.c:354
[<ffffffff82d43fe4>] snd_seq_oss_release+0xe4/0x130
sound/core/seq/oss/seq_oss_init.c:433
[<ffffffff82d42782>] odev_release+0x52/0x70
sound/core/seq/oss/seq_oss.c:152
[<ffffffff815236a3>] __fput+0x233/0x6d0 fs/file_table.c:208
[<ffffffff81523bc5>] ____fput+0x15/0x20 fs/file_table.c:244
[<ffffffff8118b9e4>] task_work_run+0x104/0x180 kernel/task_work.c:115
[<ffffffff81132f8a>] exit_task_work include/linux/task_work.h:21 [inline]
[<ffffffff81132f8a>] do_exit+0x82a/0x2a10 kernel/exit.c:755
[<ffffffff81139428>] do_group_exit+0x108/0x320 kernel/exit.c:885
[<ffffffff8113965d>] SYSC_exit_group kernel/exit.c:896 [inline]
[<ffffffff8113965d>] SyS_exit_group+0x1d/0x20 kernel/exit.c:894
[<ffffffff8377441f>] entry_SYSCALL_64_fastpath+0x1c/0x98
INFO: lockdep is turned off.
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 486 Comm: khungtaskd Not tainted 4.4.115-gaa856bd #6
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
task: ffff8800bad81800 task.stack: ffff8800bad08000
RIP: 0010:[<ffffffff810c3ec7>] [<ffffffff810c3ec7>] native_apic_mem_write
arch/x86/include/asm/apic.h:94 [inline]
RIP: 0010:[<ffffffff810c3ec7>] [<ffffffff810c3ec7>]
__default_send_IPI_dest_field arch/x86/include/asm/ipi.h:119 [inline]
RIP: 0010:[<ffffffff810c3ec7>] [<ffffffff810c3ec7>] _flat_send_IPI_mask
arch/x86/kernel/apic/apic_flat_64.c:61 [inline]
RIP: 0010:[<ffffffff810c3ec7>] [<ffffffff810c3ec7>]
flat_send_IPI_mask+0xf7/0x1a0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8800bad0fcb8 EFLAGS: 00000046
RAX: 0000000003000000 RBX: 0000000000000c00 RCX: ffffffff8126a292
RDX: 0000000000000c00 RSI: 0000000000000002 RDI: ffffffffff5fb300
RBP: ffff8800bad0fce0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: fffffbfff0ad7e2c R12: 0000000000000246
R13: 0000000000000003 R14: ffffffff8426f3a0 R15: 0000000000000002
FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9ed182f9ce CR3: 00000001d21c2000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
ffffffff8426f3a0 ffffffff847ef7c0 fffffbfff08fd9ac dffffc0000000000
ffff8801db31bca0 ffff8800bad0fd00 ffffffff810b99fb ffffffff839f61c0
0000000000000003 ffff8800bad0fd60 ffffffff81d0ed14 ffffffff839fe320
Call Trace:
[<ffffffff810b99fb>] nmi_raise_cpu_backtrace+0x5b/0x70
arch/x86/kernel/apic/hw_nmi.c:33
[<ffffffff81d0ed14>] nmi_trigger_all_cpu_backtrace+0x4a4/0x550
lib/nmi_backtrace.c:85
[<ffffffff810b9a94>] arch_trigger_all_cpu_backtrace+0x14/0x20
arch/x86/kernel/apic/hw_nmi.c:38
[<ffffffff81368cca>] trigger_all_cpu_backtrace include/linux/nmi.h:44
[inline]
[<ffffffff81368cca>] check_hung_task kernel/hung_task.c:125 [inline]
[<ffffffff81368cca>] check_hung_uninterruptible_tasks
kernel/hung_task.c:182 [inline]
[<ffffffff81368cca>] watchdog+0x6fa/0xae0 kernel/hung_task.c:238
[<ffffffff811907e8>] kthread+0x268/0x300 kernel/kthread.c:211
[<ffffffff83774845>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:506
Code: b3 5f ff f6 c4 10 75 e1 44 89 e8 c1 e0 18 89 04 25 10 b3 5f ff 44 89
fa 09 da 80 cf 04 41 83 ff 02 0f 44 d3 89 14 25 00 b3 5f ff <41> f7 c4 00
02 00 00 74 1a e8 0b 2f 17 00 4c 89 e7 57 9d 0f 1f
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.115-gaa856bd #6
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
task: ffff8801d9b49800 task.stack: ffff8801d9b58000
RIP: 0010:[<ffffffff810d0536>] [<ffffffff810d0536>]
native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:49
RSP: 0018:ffff8801d9b5fd98 EFLAGS: 00000246
RAX: 0000000000000003 RBX: ffffffff847dd8c8 RCX: ffffffff81d63b5b
RDX: 0000000000000004 RSI: ffffffff839fe320 RDI: ffffffff84418180
RBP: ffff8801d9b5fd98 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 1ffff1003b36bf82 R12: 0000000000000001
R13: fffffbfff070887c R14: ffffffff847ebc38 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0628c669b8 CR3: 00000001d21c2000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
ffff8801d9b5fdd0 ffffffff81027ed5 ffff8801d9b60000 ffffffff847dd8c8
fffffbfff070887c ffffffff847ebc38 0000000000000000 ffff8801d9b5fde0
ffffffff8102945a ffff8801d9b5fdf8 ffffffff81221468 dffffc0000000000
Call Trace:
[<ffffffff81027ed5>] arch_safe_halt arch/x86/include/asm/paravirt.h:117
[inline]
[<ffffffff81027ed5>] default_idle+0x55/0x3c0 arch/x86/kernel/process.c:291
[<ffffffff8102945a>] arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:282
[<ffffffff81221468>] default_idle_call+0x48/0x70 kernel/sched/idle.c:93
[<ffffffff81221b6d>] cpuidle_idle_call kernel/sched/idle.c:157 [inline]
[<ffffffff81221b6d>] cpu_idle_loop kernel/sched/idle.c:253 [inline]
[<ffffffff81221b6d>] cpu_startup_entry+0x5fd/0x8f0 kernel/sched/idle.c:301
[<ffffffff810adcc4>] start_secondary+0x304/0x3e0
arch/x86/kernel/smpboot.c:242
Code: 00 00 00 00 00 55 48 89 e5 fa 5d c3 66 0f 1f 84 00 00 00 00 00 55 48
89 e5 fb 5d c3 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 fb f4 <5d> c3 0f 1f
84 00 00 00 00 00 55 48 89 e5 f4 5d c3 66 0f 1f 84
---
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 can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
syzbot found the following crash on:
HEAD commit: aa856bd8 Merge 4.4.115 into android-4.4
git tree: android-4.4
console output: https://syzkaller.appspot.com/x/log.txt?x=104436b5800000
kernel config: https://syzkaller.appspot.com/x/.config?x=58e89c40ea7f5c9c
dashboard link: https://syzkaller.appspot.com/bug?extid=0798954268ed02d0c566
compiler: gcc (GCC) 7.1.1 20170620
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10a7d0c5800000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14991ab5800000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+079895...@syzkaller.appspotmail.com
INFO: task syzkaller454913:3769 blocked for more than 120 seconds.
Not tainted 4.4.115-gaa856bd #6
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syzkaller454913 D ffff8801d8a27648 27976 3769 3767 0x00000002
ffff8801d8a27648 0000000000000000 0000000000000000 0000000000000000
0000000000000001 ffff8801d8a27600 ffff8801db21fdb8 ffff8801db21fde0
ffff8801db21f4d8 ffffffff84217840 ffff8801d8891800 0000000000000000
Call Trace:
[<ffffffff837662da>] schedule+0x7a/0x1b0 kernel/sched/core.c:3353
[<ffffffff83766ad3>] schedule_preempt_disabled+0x13/0x20
kernel/sched/core.c:3386
[<ffffffff8376b096>] __mutex_lock_common kernel/locking/mutex.c:582
[inline]
[<ffffffff8376b096>] mutex_lock_nested+0x306/0x850
kernel/locking/mutex.c:621
[<ffffffff82d2ad8d>] snd_seq_do_ioctl+0x15d/0x1b0
sound/core/seq/seq_clientmgr.c:2214
[<ffffffff82d2aeb7>] snd_seq_kernel_client_ctl+0xd7/0x150
sound/core/seq/seq_clientmgr.c:2432
[<ffffffff82d54150>] snd_seq_oss_control
sound/core/seq/oss/seq_oss_device.h:157 [inline]
[<ffffffff82d54150>] snd_seq_oss_writeq_clear+0xe0/0x140
sound/core/seq/oss/seq_oss_writeq.c:84
[<ffffffff82d541cf>] snd_seq_oss_writeq_delete+0x1f/0x30
sound/core/seq/oss/seq_oss_writeq.c:68
[<ffffffff82d42d71>] free_devinfo+0x61/0xb0
sound/core/seq/oss/seq_oss_init.c:406
[<ffffffff82d3d015>] port_delete+0xd5/0x110 sound/core/seq/seq_ports.c:273
[<ffffffff82d3d913>] snd_seq_delete_port+0x1c3/0x200
sound/core/seq/seq_ports.c:303
[<ffffffff82d29142>] snd_seq_ioctl_delete_port+0xf2/0x1d0
sound/core/seq/seq_clientmgr.c:1326
[<ffffffff82d2adb2>] snd_seq_do_ioctl+0x182/0x1b0
sound/core/seq/seq_clientmgr.c:2215
[<ffffffff82d2aeb7>] snd_seq_kernel_client_ctl+0xd7/0x150
sound/core/seq/seq_clientmgr.c:2432
[<ffffffff82d3bd5f>] snd_seq_event_port_detach+0xaf/0x100
sound/core/seq/seq_ports.c:706
[<ffffffff82d42e33>] delete_port+0x73/0xb0
sound/core/seq/oss/seq_oss_init.c:354
[<ffffffff82d43fe4>] snd_seq_oss_release+0xe4/0x130
sound/core/seq/oss/seq_oss_init.c:433
[<ffffffff82d42782>] odev_release+0x52/0x70
sound/core/seq/oss/seq_oss.c:152
[<ffffffff815236a3>] __fput+0x233/0x6d0 fs/file_table.c:208
[<ffffffff81523bc5>] ____fput+0x15/0x20 fs/file_table.c:244
[<ffffffff8118b9e4>] task_work_run+0x104/0x180 kernel/task_work.c:115
[<ffffffff81132f8a>] exit_task_work include/linux/task_work.h:21 [inline]
[<ffffffff81132f8a>] do_exit+0x82a/0x2a10 kernel/exit.c:755
[<ffffffff81139428>] do_group_exit+0x108/0x320 kernel/exit.c:885
[<ffffffff8113965d>] SYSC_exit_group kernel/exit.c:896 [inline]
[<ffffffff8113965d>] SyS_exit_group+0x1d/0x20 kernel/exit.c:894
[<ffffffff8377441f>] entry_SYSCALL_64_fastpath+0x1c/0x98
INFO: lockdep is turned off.
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 486 Comm: khungtaskd Not tainted 4.4.115-gaa856bd #6
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
task: ffff8800bad81800 task.stack: ffff8800bad08000
RIP: 0010:[<ffffffff810c3ec7>] [<ffffffff810c3ec7>] native_apic_mem_write
arch/x86/include/asm/apic.h:94 [inline]
RIP: 0010:[<ffffffff810c3ec7>] [<ffffffff810c3ec7>]
__default_send_IPI_dest_field arch/x86/include/asm/ipi.h:119 [inline]
RIP: 0010:[<ffffffff810c3ec7>] [<ffffffff810c3ec7>] _flat_send_IPI_mask
arch/x86/kernel/apic/apic_flat_64.c:61 [inline]
RIP: 0010:[<ffffffff810c3ec7>] [<ffffffff810c3ec7>]
flat_send_IPI_mask+0xf7/0x1a0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8800bad0fcb8 EFLAGS: 00000046
RAX: 0000000003000000 RBX: 0000000000000c00 RCX: ffffffff8126a292
RDX: 0000000000000c00 RSI: 0000000000000002 RDI: ffffffffff5fb300
RBP: ffff8800bad0fce0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: fffffbfff0ad7e2c R12: 0000000000000246
R13: 0000000000000003 R14: ffffffff8426f3a0 R15: 0000000000000002
FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9ed182f9ce CR3: 00000001d21c2000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
ffffffff8426f3a0 ffffffff847ef7c0 fffffbfff08fd9ac dffffc0000000000
ffff8801db31bca0 ffff8800bad0fd00 ffffffff810b99fb ffffffff839f61c0
0000000000000003 ffff8800bad0fd60 ffffffff81d0ed14 ffffffff839fe320
Call Trace:
[<ffffffff810b99fb>] nmi_raise_cpu_backtrace+0x5b/0x70
arch/x86/kernel/apic/hw_nmi.c:33
[<ffffffff81d0ed14>] nmi_trigger_all_cpu_backtrace+0x4a4/0x550
lib/nmi_backtrace.c:85
[<ffffffff810b9a94>] arch_trigger_all_cpu_backtrace+0x14/0x20
arch/x86/kernel/apic/hw_nmi.c:38
[<ffffffff81368cca>] trigger_all_cpu_backtrace include/linux/nmi.h:44
[inline]
[<ffffffff81368cca>] check_hung_task kernel/hung_task.c:125 [inline]
[<ffffffff81368cca>] check_hung_uninterruptible_tasks
kernel/hung_task.c:182 [inline]
[<ffffffff81368cca>] watchdog+0x6fa/0xae0 kernel/hung_task.c:238
[<ffffffff811907e8>] kthread+0x268/0x300 kernel/kthread.c:211
[<ffffffff83774845>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:506
Code: b3 5f ff f6 c4 10 75 e1 44 89 e8 c1 e0 18 89 04 25 10 b3 5f ff 44 89
fa 09 da 80 cf 04 41 83 ff 02 0f 44 d3 89 14 25 00 b3 5f ff <41> f7 c4 00
02 00 00 74 1a e8 0b 2f 17 00 4c 89 e7 57 9d 0f 1f
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.115-gaa856bd #6
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
task: ffff8801d9b49800 task.stack: ffff8801d9b58000
RIP: 0010:[<ffffffff810d0536>] [<ffffffff810d0536>]
native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:49
RSP: 0018:ffff8801d9b5fd98 EFLAGS: 00000246
RAX: 0000000000000003 RBX: ffffffff847dd8c8 RCX: ffffffff81d63b5b
RDX: 0000000000000004 RSI: ffffffff839fe320 RDI: ffffffff84418180
RBP: ffff8801d9b5fd98 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 1ffff1003b36bf82 R12: 0000000000000001
R13: fffffbfff070887c R14: ffffffff847ebc38 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0628c669b8 CR3: 00000001d21c2000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
ffff8801d9b5fdd0 ffffffff81027ed5 ffff8801d9b60000 ffffffff847dd8c8
fffffbfff070887c ffffffff847ebc38 0000000000000000 ffff8801d9b5fde0
ffffffff8102945a ffff8801d9b5fdf8 ffffffff81221468 dffffc0000000000
Call Trace:
[<ffffffff81027ed5>] arch_safe_halt arch/x86/include/asm/paravirt.h:117
[inline]
[<ffffffff81027ed5>] default_idle+0x55/0x3c0 arch/x86/kernel/process.c:291
[<ffffffff8102945a>] arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:282
[<ffffffff81221468>] default_idle_call+0x48/0x70 kernel/sched/idle.c:93
[<ffffffff81221b6d>] cpuidle_idle_call kernel/sched/idle.c:157 [inline]
[<ffffffff81221b6d>] cpu_idle_loop kernel/sched/idle.c:253 [inline]
[<ffffffff81221b6d>] cpu_startup_entry+0x5fd/0x8f0 kernel/sched/idle.c:301
[<ffffffff810adcc4>] start_secondary+0x304/0x3e0
arch/x86/kernel/smpboot.c:242
Code: 00 00 00 00 00 55 48 89 e5 fa 5d c3 66 0f 1f 84 00 00 00 00 00 55 48
89 e5 fb 5d c3 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 fb f4 <5d> c3 0f 1f
84 00 00 00 00 00 55 48 89 e5 f4 5d c3 66 0f 1f 84
---
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 can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
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