R13: 00000000000009d1 R14: 00000000004cb3b1 R15: 0000000000000002 BUG: sleeping function called from invalid context at kernel/locking/mutex.c:908 in_atomic(): 1, irqs_disabled(): 0, pid: 6558, name: syz-executor.0 2 locks held by syz-executor.0/6558: #0: 000000009089d8ee (sk_lock-AF_INET){+.+.}, at: lock_sock include/net/sock.h:1506 [inline] #0: 000000009089d8ee (sk_lock-AF_INET){+.+.}, at: sctp_sendmsg+0x68e/0x17d0 net/sctp/socket.c:2056 #1: 000000003b3e7a5b ((&sp->resync_t)){+.-.}, at: lockdep_copy_map include/linux/lockdep.h:168 [inline] #1: 000000003b3e7a5b ((&sp->resync_t)){+.-.}, at: call_timer_fn+0xda/0x720 kernel/time/timer.c:1316 Preemption disabled at: [] preempt_schedule_irq+0x88/0x140 kernel/sched/core.c:3740 CPU: 0 PID: 6558 Comm: syz-executor.0 Not tainted 4.19.99-syzkaller #0 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+0x197/0x210 lib/dump_stack.c:118 ___might_sleep.cold+0x1bd/0x1f6 kernel/sched/core.c:6192 __might_sleep+0x95/0x190 kernel/sched/core.c:6145 __mutex_lock_common kernel/locking/mutex.c:908 [inline] __mutex_lock+0xc8/0x1300 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 tpk_write+0x5d/0x340 drivers/char/ttyprintk.c:123 resync_tnc+0x1b6/0x320 drivers/net/hamradio/6pack.c:522 call_timer_fn+0x18d/0x720 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers kernel/time/timer.c:1684 [inline] __run_timers kernel/time/timer.c:1652 [inline] run_timer_softirq+0x64f/0x16a0 kernel/time/timer.c:1697 __do_softirq+0x25c/0x921 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1094 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893 RIP: 0010:preempt_schedule_irq+0xab/0x140 kernel/sched/core.c:3742 Code: 00 00 e8 68 34 f5 f9 e8 23 90 1c fa 4c 89 f0 48 c1 e8 03 80 3c 18 00 75 6c 48 83 3d 66 a7 9e 01 00 74 5e fb 66 0f 1f 44 00 00 01 00 00 00 e8 8b d4 ff ff 48 c7 c0 50 57 f2 88 48 c1 e8 03 80 RSP: 0018:ffff88808f8e7638 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff11e4aeb RBX: dffffc0000000000 RCX: 1ffff11009e42534 RDX: 0000000000000000 RSI: ffff88804f212980 RDI: ffff88804f21297c RBP: ffff88808f8e7658 R08: ffff88804f212100 R09: ffff88804f2129a0 R10: 0000000000000000 R11: 0000000000000000 R12: ffffed1009e42420 R13: ffff88804f212100 R14: ffffffff88f25758 R15: 0000000000000000 retint_kernel+0x1b/0x2d RIP: 0010:arch_local_irq_restore+0x4e/0x56 arch/x86/include/asm/paravirt.h:789 Code: 00 74 0c 48 c7 c7 48 57 f2 88 e8 a3 7b 55 fa 48 83 3d 53 2f a5 01 00 75 07 e8 94 dc 1d fa 0f 0b e8 8d dc 1d fa 48 89 df 57 9d <0f> 1f 44 00 00 5b 5d c3 e8 7b dc 1d fa 48 c7 c2 00 ae 87 8b 4c 89 RSP: 0018:ffff88808f8e7718 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff02 RAX: 0000000000040000 RBX: 0000000000000246 RCX: ffffc90005e96000 RDX: 0000000000040000 RSI: ffffffff874d2803 RDI: 0000000000000246 RBP: ffff88808f8e7720 R08: ffff88804f212100 R09: ffff88804f2129a0 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000246 R13: 00000000ffffffff R14: 0000000000000200 R15: dffffc0000000000 dump_stack+0x1fe/0x210 lib/dump_stack.c:123 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0xa/0x1b lib/fault-inject.c:149 __should_failslab+0x121/0x190 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1558 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] kmem_cache_alloc_trace+0x2cc/0x760 mm/slab.c:3623 kmalloc include/linux/slab.h:515 [inline] kzalloc include/linux/slab.h:709 [inline] sctp_auth_shkey_create+0x68/0x190 net/sctp/auth.c:99 sctp_auth_asoc_copy_shkeys+0x1fd/0x2c0 net/sctp/auth.c:378 sctp_association_init net/sctp/associola.c:274 [inline] sctp_association_new+0x15cf/0x1fb0 net/sctp/associola.c:317 sctp_sendmsg_new_asoc+0x397/0xfd0 net/sctp/socket.c:1726 sctp_sendmsg+0x125a/0x17d0 net/sctp/socket.c:2090 inet_sendmsg+0x141/0x5d0 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:632 __sys_sendto+0x262/0x380 net/socket.c:1787 __do_sys_sendto net/socket.c:1799 [inline] __se_sys_sendto net/socket.c:1795 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1795 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45b349 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f02b5357c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f02b53586d4 RCX: 000000000045b349 RDX: 0000000000000001 RSI: 00000000203cef9f RDI: 0000000000000006 RBP: 000000000075bf20 R08: 0000000020618000 R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000007 R13: 00000000000009d1 R14: 00000000004cb3b1 R15: 0000000000000002 ================================ WARNING: inconsistent lock state 4.19.99-syzkaller #0 Tainted: G W -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.0/6558 [HC0[0]:SC1[1]:HE1:SE0] takes: 000000009e322990 (&tpk_port.port_write_mutex){+.?.}, at: tpk_write+0x5d/0x340 drivers/char/ttyprintk.c:123 {SOFTIRQ-ON-W} state was registered at: lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xf7/0x1300 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 tpk_close+0x50/0x95 drivers/char/ttyprintk.c:104 tty_release+0x3ba/0xe90 drivers/tty/tty_io.c:1678 __fput+0x2dd/0x8b0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe irq event stamp: 932 hardirqs last enabled at (932): [] trace_hardirqs_on_thunk+0x1a/0x1c hardirqs last disabled at (931): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (446): [] lock_sock_nested+0x9a/0x120 net/core/sock.c:2841 softirqs last disabled at (779): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (779): [] irq_exit+0x180/0x1d0 kernel/softirq.c:412 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&tpk_port.port_write_mutex); lock(&tpk_port.port_write_mutex); *** DEADLOCK *** 2 locks held by syz-executor.0/6558: #0: 000000009089d8ee (sk_lock-AF_INET){+.+.}, at: lock_sock include/net/sock.h:1506 [inline] #0: 000000009089d8ee (sk_lock-AF_INET){+.+.}, at: sctp_sendmsg+0x68e/0x17d0 net/sctp/socket.c:2056 #1: 000000003b3e7a5b ((&sp->resync_t)){+.-.}, at: lockdep_copy_map include/linux/lockdep.h:168 [inline] #1: 000000003b3e7a5b ((&sp->resync_t)){+.-.}, at: call_timer_fn+0xda/0x720 kernel/time/timer.c:1316 stack backtrace: CPU: 0 PID: 6558 Comm: syz-executor.0 Tainted: G W 4.19.99-syzkaller #0 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+0x197/0x210 lib/dump_stack.c:118 print_usage_bug.cold+0x330/0x42a kernel/locking/lockdep.c:2540 valid_state kernel/locking/lockdep.c:2553 [inline] mark_lock_irq kernel/locking/lockdep.c:2747 [inline] mark_lock+0xd1b/0x1370 kernel/locking/lockdep.c:3127 mark_irqflags kernel/locking/lockdep.c:3005 [inline] __lock_acquire+0xc62/0x49c0 kernel/locking/lockdep.c:3368 lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xf7/0x1300 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 tpk_write+0x5d/0x340 drivers/char/ttyprintk.c:123 resync_tnc+0x1b6/0x320 drivers/net/hamradio/6pack.c:522 call_timer_fn+0x18d/0x720 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers kernel/time/timer.c:1684 [inline] __run_timers kernel/time/timer.c:1652 [inline] run_timer_softirq+0x64f/0x16a0 kernel/time/timer.c:1697 __do_softirq+0x25c/0x921 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1094 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893 RIP: 0010:preempt_schedule_irq+0xab/0x140 kernel/sched/core.c:3742 Code: 00 00 e8 68 34 f5 f9 e8 23 90 1c fa 4c 89 f0 48 c1 e8 03 80 3c 18 00 75 6c 48 83 3d 66 a7 9e 01 00 74 5e fb 66 0f 1f 44 00 00 01 00 00 00 e8 8b d4 ff ff 48 c7 c0 50 57 f2 88 48 c1 e8 03 80 RSP: 0018:ffff88808f8e7638 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff11e4aeb RBX: dffffc0000000000 RCX: 1ffff11009e42534 RDX: 0000000000000000 RSI: ffff88804f212980 RDI: ffff88804f21297c RBP: ffff88808f8e7658 R08: ffff88804f212100 R09: ffff88804f2129a0 R10: 0000000000000000 R11: 0000000000000000 R12: ffffed1009e42420 R13: ffff88804f212100 R14: ffffffff88f25758 R15: 0000000000000000 retint_kernel+0x1b/0x2d RIP: 0010:arch_local_irq_restore+0x4e/0x56 arch/x86/include/asm/paravirt.h:789 Code: 00 74 0c 48 c7 c7 48 57 f2 88 e8 a3 7b 55 fa 48 83 3d 53 2f a5 01 00 75 07 e8 94 dc 1d fa 0f 0b e8 8d dc 1d fa 48 89 df 57 9d <0f> 1f 44 00 00 5b 5d c3 e8 7b dc 1d fa 48 c7 c2 00 ae 87 8b 4c 89 RSP: 0018:ffff88808f8e7718 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff02 RAX: 0000000000040000 RBX: 0000000000000246 RCX: ffffc90005e96000 RDX: 0000000000040000 RSI: ffffffff874d2803 RDI: 0000000000000246 RBP: ffff88808f8e7720 R08: ffff88804f212100 R09: ffff88804f2129a0 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000246 R13: 00000000ffffffff R14: 0000000000000200 R15: dffffc0000000000 dump_stack+0x1fe/0x210 lib/dump_stack.c:123 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0xa/0x1b lib/fault-inject.c:149 __should_failslab+0x121/0x190 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1558 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] kmem_cache_alloc_trace+0x2cc/0x760 mm/slab.c:3623 kmalloc include/linux/slab.h:515 [inline] kzalloc include/linux/slab.h:709 [inline] sctp_auth_shkey_create+0x68/0x190 net/sctp/auth.c:99 sctp_auth_asoc_copy_shkeys+0x1fd/0x2c0 net/sctp/auth.c:378 sctp_association_init net/sctp/associola.c:274 [inline] sctp_association_new+0x15cf/0x1fb0 net/sctp/associola.c:317 sctp_sendmsg_new_asoc+0x397/0xfd0 net/sctp/socket.c:1726 sctp_sendmsg+0x125a/0x17d0 net/sctp/socket.c:2090 inet_sendmsg+0x141/0x5d0 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:632 __sys_sendto+0x262/0x380 net/socket.c:1787 __do_sys_sendto net/socket.c:1799 [inline] __se_sys_sendto net/socket.c:1795 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1795 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45b349 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f02b5357c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f02b53586d4 RCX: 000000000045b349 RDX: 0000000000000001 RSI: 00000000203cef9f RDI: 0000000000000006 RBP: 000000000075bf20 R08: 0000000020618000 R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000007 R13: 00000000000009d1 R14: 00000000004cb3b1 R15: 0000000000000002 BUG: sleeping function called from invalid context at kernel/locking/mutex.c:908 in_atomic(): 1, irqs_disabled(): 0, pid: 6558, name: syz-executor.0 INFO: lockdep is turned off. Preemption disabled at: [] preempt_schedule_irq+0x88/0x140 kernel/sched/core.c:3740 CPU: 0 PID: 6558 Comm: syz-executor.0 Tainted: G W 4.19.99-syzkaller #0 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+0x197/0x210 lib/dump_stack.c:118 ___might_sleep.cold+0x1bd/0x1f6 kernel/sched/core.c:6192 __might_sleep+0x95/0x190 kernel/sched/core.c:6145 __mutex_lock_common kernel/locking/mutex.c:908 [inline] __mutex_lock+0xc8/0x1300 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 tpk_write+0x5d/0x340 drivers/char/ttyprintk.c:123 resync_tnc+0x22e/0x320 drivers/net/hamradio/6pack.c:523 call_timer_fn+0x18d/0x720 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers kernel/time/timer.c:1684 [inline] __run_timers kernel/time/timer.c:1652 [inline] run_timer_softirq+0x64f/0x16a0 kernel/time/timer.c:1697 __do_softirq+0x25c/0x921 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1094 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893 RIP: 0010:preempt_schedule_irq+0xab/0x140 kernel/sched/core.c:3742 Code: 00 00 e8 68 34 f5 f9 e8 23 90 1c fa 4c 89 f0 48 c1 e8 03 80 3c 18 00 75 6c 48 83 3d 66 a7 9e 01 00 74 5e fb 66 0f 1f 44 00 00 01 00 00 00 e8 8b d4 ff ff 48 c7 c0 50 57 f2 88 48 c1 e8 03 80 RSP: 0018:ffff88808f8e7638 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff11e4aeb RBX: dffffc0000000000 RCX: 1ffff11009e42534 RDX: 0000000000000000 RSI: ffff88804f212980 RDI: ffff88804f21297c RBP: ffff88808f8e7658 R08: ffff88804f212100 R09: ffff88804f2129a0 R10: 0000000000000000 R11: 0000000000000000 R12: ffffed1009e42420 R13: ffff88804f212100 R14: ffffffff88f25758 R15: 0000000000000000 retint_kernel+0x1b/0x2d RIP: 0010:arch_local_irq_restore+0x4e/0x56 arch/x86/include/asm/paravirt.h:789 Code: 00 74 0c 48 c7 c7 48 57 f2 88 e8 a3 7b 55 fa 48 83 3d 53 2f a5 01 00 75 07 e8 94 dc 1d fa 0f 0b e8 8d dc 1d fa 48 89 df 57 9d <0f> 1f 44 00 00 5b 5d c3 e8 7b dc 1d fa 48 c7 c2 00 ae 87 8b 4c 89 RSP: 0018:ffff88808f8e7718 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff02 RAX: 0000000000040000 RBX: 0000000000000246 RCX: ffffc90005e96000 RDX: 0000000000040000 RSI: ffffffff874d2803 RDI: 0000000000000246 RBP: ffff88808f8e7720 R08: ffff88804f212100 R09: ffff88804f2129a0 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000246 R13: 00000000ffffffff R14: 0000000000000200 R15: dffffc0000000000 dump_stack+0x1fe/0x210 lib/dump_stack.c:123 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0xa/0x1b lib/fault-inject.c:149 __should_failslab+0x121/0x190 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1558 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] kmem_cache_alloc_trace+0x2cc/0x760 mm/slab.c:3623 kmalloc include/linux/slab.h:515 [inline] kzalloc include/linux/slab.h:709 [inline] sctp_auth_shkey_create+0x68/0x190 net/sctp/auth.c:99 sctp_auth_asoc_copy_shkeys+0x1fd/0x2c0 net/sctp/auth.c:378 sctp_association_init net/sctp/associola.c:274 [inline] sctp_association_new+0x15cf/0x1fb0 net/sctp/associola.c:317 sctp_sendmsg_new_asoc+0x397/0xfd0 net/sctp/socket.c:1726 sctp_sendmsg+0x125a/0x17d0 net/sctp/socket.c:2090 inet_sendmsg+0x141/0x5d0 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:632 __sys_sendto+0x262/0x380 net/socket.c:1787 __do_sys_sendto net/socket.c:1799 [inline] __se_sys_sendto net/socket.c:1795 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1795 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45b349 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f02b5357c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f02b53586d4 RCX: 000000000045b349 RDX: 0000000000000001 RSI: 00000000203cef9f RDI: 0000000000000006 RBP: 000000000075bf20 R08: 0000000020618000 R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000007 R13: 00000000000009d1 R14: 00000000004cb3b1 R15: 0000000000000002 BUG: sleeping function called from invalid context at kernel/locking/mutex.c:908 in_atomic(): 1, irqs_disabled(): 0, pid: 6886, name: blkid INFO: lockdep is turned off. Preemption disabled at: [] __do_softirq+0xf3/0x921 kernel/softirq.c:269 CPU: 0 PID: 6886 Comm: blkid Tainted: G W 4.19.99-syzkaller #0 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+0x197/0x210 lib/dump_stack.c:118 ___might_sleep.cold+0x1bd/0x1f6 kernel/sched/core.c:6192 __might_sleep+0x95/0x190 kernel/sched/core.c:6145 __mutex_lock_common kernel/locking/mutex.c:908 [inline] __mutex_lock+0xc8/0x1300 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 tpk_write+0x5d/0x340 drivers/char/ttyprintk.c:123 resync_tnc+0x1b6/0x320 drivers/net/hamradio/6pack.c:522 call_timer_fn+0x18d/0x720 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers kernel/time/timer.c:1684 [inline] __run_timers kernel/time/timer.c:1652 [inline] run_timer_softirq+0x64f/0x16a0 kernel/time/timer.c:1697 __do_softirq+0x25c/0x921 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1094 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893 RIP: 0010:read_word_at_a_time+0x1/0x20 include/linux/compiler.h:274 Code: 00 00 e9 3a ff ff ff 4c 89 e7 e8 7a 6a f0 ff e9 13 ff ff ff 4c 89 ef e8 8d 6a f0 ff e9 4f ff ff ff 0f 1f 84 00 00 00 00 00 55 <48> 89 e5 53 48 89 fb e8 73 cb b8 ff 48 89 df be 01 00 00 00 e8 56 RSP: 0018:ffff88802e7b7720 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff88804f188000 RBX: 0000000000000003 RCX: ffffffff81b2e5ed RDX: 0000000000000000 RSI: ffffffff81b2e656 RDI: ffff888087d9e780 RBP: ffff88802e7b77c8 R08: ffff88804f188000 R09: ffffed1005cf6f1f R10: ffffed1005cf6f1e R11: 0000000000000003 R12: 000000032d61e5b1 R13: ffff888087d9e780 R14: ffff888087d9e750 R15: dffffc0000000000 lookup_fast+0x139/0x11a0 fs/namei.c:1571 walk_component+0xef/0x2000 fs/namei.c:1806 link_path_walk.part.0+0x980/0x1330 fs/namei.c:2141 link_path_walk fs/namei.c:2072 [inline] path_openat+0x1f9/0x45e0 fs/namei.c:3533 do_filp_open+0x1a1/0x280 fs/namei.c:3564 do_sys_open+0x3fe/0x550 fs/open.c:1088 __do_sys_open fs/open.c:1106 [inline] __se_sys_open fs/open.c:1101 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1101 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fbda28191a7 Code: c3 66 90 c7 05 fa af 20 00 16 00 00 00 b8 ff ff ff ff c3 f7 d8 89 05 ec af 20 00 83 c8 ff c3 90 90 90 90 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8d 0d cd af 20 00 31 d2 48 29 c2 89 RSP: 002b:00007ffe037afd98 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000400f31 RCX: 00007fbda28191a7 RDX: 0000000000000001 RSI: 0000000000000000 RDI: 00007fbda281d282 RBP: 0000000000000001 R08: 00007fbda2a24570 R09: 0000000000000000 R10: ffffffffffffffb0 R11: 0000000000000246 R12: 00007fbda2a24090 R13: 00007fbda2a23040 R14: 0000000000000000 R15: 00007fbda2a24570