bisecting fixing commit since c500bee1c5b2f1d59b1081ac879d73268ab0ff17 building syzkaller on 6c236867ce33c0c16b102e02a08226d7eb9b2046 testing commit c500bee1c5b2f1d59b1081ac879d73268ab0ff17 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: f37f086530a42b0fccbf7199f77a15e621fe6e2c5f4f14548173af572ba8fbf8 run #0: crashed: BUG: sleeping function called from invalid context in lock_sock_nested run #1: crashed: BUG: sleeping function called from invalid context in lock_sock_nested run #2: crashed: BUG: sleeping function called from invalid context in lock_sock_nested run #3: crashed: BUG: sleeping function called from invalid context in lock_sock_nested run #4: crashed: BUG: sleeping function called from invalid context in lock_sock_nested run #5: crashed: BUG: sleeping function called from invalid context in lock_sock_nested run #6: crashed: BUG: sleeping function called from invalid context in lock_sock_nested run #7: crashed: BUG: sleeping function called from invalid context in lock_sock_nested run #8: crashed: INFO: task hung in flush_to_ldisc run #9: crashed: BUG: sleeping function called from invalid context in lock_sock_nested run #10: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "/tmp/syz-executor567240031" "root@10.128.1.39:./syz-executor567240031"]: exit status 1 Connection timed out during banner exchange Connection to 10.128.1.39 port 22 timed out lost connection run #11: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "/tmp/syz-executor299522866" "root@10.128.0.172:./syz-executor299522866"]: exit status 1 Connection timed out during banner exchange Connection to 10.128.0.172 port 22 timed out lost connection run #12: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "/tmp/syz-executor054365443" "root@10.128.10.29:./syz-executor054365443"]: exit status 1 Connection timed out during banner exchange Connection to 10.128.10.29 port 22 timed out lost connection run #13: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "/tmp/syz-executor315224621" "root@10.128.10.32:./syz-executor315224621"]: exit status 1 Connection timed out during banner exchange Connection to 10.128.10.32 port 22 timed out lost connection run #14: crashed: BUG: sleeping function called from invalid context in lock_sock_nested run #15: OK run #16: OK run #17: OK run #18: OK run #19: OK testing current HEAD dcb85f85fa6f142aae1fe86f399d4503d49f2b60 testing commit dcb85f85fa6f142aae1fe86f399d4503d49f2b60 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 64a49900819d4dc987d04c7715e85cc11ac1b89c0758640934b9d6997ce7284d run #0: crashed: INFO: task hung in flush_to_ldisc run #1: crashed: INFO: task hung in paste_selection run #2: crashed: INFO: task hung in set_selection_user run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK reproducer seems to be flaky Reproducer flagged being flaky revisions tested: 2, total time: 37m52.139043578s (build: 13m17.035725891s, test: 23m54.17469668s) the crash still happens on HEAD commit msg: gcc-plugins/stackleak: Use noinstr in favor of notrace crash: INFO: task hung in set_selection_user INFO: task syz-executor.2:6208 blocked for more than 143 seconds. Not tainted 5.17.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:27968 pid: 6208 ppid: 6071 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4986 [inline] __schedule+0x90d/0x2680 kernel/sched/core.c:6295 schedule+0xd2/0x260 kernel/sched/core.c:6368 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6427 __mutex_lock_common kernel/locking/mutex.c:673 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:733 set_selection_kernel drivers/tty/vt/selection.c:357 [inline] set_selection_user+0x81/0x180 drivers/tty/vt/selection.c:185 vt_ioctl+0x19a7/0x2120 drivers/tty/vt/vt_ioctl.c:762 tty_ioctl+0x478/0x1290 drivers/tty/tty_io.c:2778 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x11f/0x190 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 RSP: 002b:00007f624b7e1188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000020000000 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffd9c7b72cf R14: 00007f624b7e1300 R15: 0000000000022000 INFO: task syz-executor.2:6216 blocked for more than 143 seconds. Not tainted 5.17.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:28560 pid: 6216 ppid: 6071 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4986 [inline] __schedule+0x90d/0x2680 kernel/sched/core.c:6295 schedule+0xd2/0x260 kernel/sched/core.c:6368 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6427 __mutex_lock_common kernel/locking/mutex.c:673 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:733 paste_selection+0x13f/0x450 drivers/tty/vt/selection.c:393 vt_ioctl+0x19a7/0x2120 drivers/tty/vt/vt_ioctl.c:762 tty_ioctl+0x478/0x1290 drivers/tty/tty_io.c:2778 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x11f/0x190 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 RSP: 002b:00007f624b7c0188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665e9 RDX: 0000000020000000 RSI: 000000000000541c RDI: 0000000000000004 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038 R13: 00007ffd9c7b72cf R14: 00007f624b7c0300 R15: 0000000000022000 INFO: task syz-executor.2:6218 blocked for more than 144 seconds. Not tainted 5.17.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:28528 pid: 6218 ppid: 6071 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4986 [inline] __schedule+0x90d/0x2680 kernel/sched/core.c:6295 schedule+0xd2/0x260 kernel/sched/core.c:6368 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6427 __mutex_lock_common kernel/locking/mutex.c:673 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:733 set_selection_kernel drivers/tty/vt/selection.c:357 [inline] set_selection_user+0x81/0x180 drivers/tty/vt/selection.c:185 vt_ioctl+0x19a7/0x2120 drivers/tty/vt/vt_ioctl.c:762 tty_ioctl+0x478/0x1290 drivers/tty/tty_io.c:2778 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x11f/0x190 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 RSP: 002b:00007f624b79f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c0f0 RCX: 00000000004665e9 RDX: 0000000020000000 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c0f0 R13: 00007ffd9c7b72cf R14: 00007f624b79f300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8ab78520 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6460 3 locks held by kworker/u4:2/50: #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:631 [inline] #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:658 [inline] #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x79e/0x1410 kernel/workqueue.c:2278 #1: ffffc9000137fdc0 ((work_completion)(&buf->work)){+.+.}-{0:0}, at: process_one_work+0x7cb/0x1410 kernel/workqueue.c:2282 #2: ffff8880648550b8 (&buf->lock){+.+.}-{3:3}, at: flush_to_ldisc+0x34/0x420 drivers/tty/tty_buffer.c:493 3 locks held by kworker/u4:4/1015: #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:631 [inline] #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:658 [inline] #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x79e/0x1410 kernel/workqueue.c:2278 #1: ffffc900044bfdc0 ((work_completion)(&buf->work)){+.+.}-{0:0}, at: process_one_work+0x7cb/0x1410 kernel/workqueue.c:2282 #2: ffff8880792b20b8 (&buf->lock){+.+.}-{3:3}, at: flush_to_ldisc+0x34/0x420 drivers/tty/tty_buffer.c:493 2 locks held by getty/3316: #0: ffff888022d95098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x1f/0x70 drivers/tty/tty_ldisc.c:244 #1: ffffc900027562e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x9dd/0xed0 drivers/tty/n_tty.c:2077 3 locks held by syz-executor.0/6197: #0: ffff88805841c098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x1f/0x70 drivers/tty/tty_ldisc.c:244 #1: ffff8880644ca0b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x109/0x450 drivers/tty/vt/selection.c:390 #2: ffffffff8b56db28 (vc_sel.lock){+.+.}-{3:3}, at: paste_selection+0x13f/0x450 drivers/tty/vt/selection.c:393 3 locks held by syz-executor.5/6214: #0: ffff88805d1ce098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x1f/0x70 drivers/tty/tty_ldisc.c:244 #1: ffff8880792b20b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x109/0x450 drivers/tty/vt/selection.c:390 #2: ffffffff8b56db28 (vc_sel.lock){+.+.}-{3:3}, at: paste_selection+0x13f/0x450 drivers/tty/vt/selection.c:393 1 lock held by syz-executor.2/6208: #0: ffffffff8b56db28 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_kernel drivers/tty/vt/selection.c:357 [inline] #0: ffffffff8b56db28 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_user+0x81/0x180 drivers/tty/vt/selection.c:185 3 locks held by syz-executor.2/6216: #0: ffff88807d91e098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x1f/0x70 drivers/tty/tty_ldisc.c:244 #1: ffff8880724a70b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x109/0x450 drivers/tty/vt/selection.c:390 #2: ffffffff8b56db28 (vc_sel.lock){+.+.}-{3:3}, at: paste_selection+0x13f/0x450 drivers/tty/vt/selection.c:393 1 lock held by syz-executor.2/6218: #0: ffffffff8b56db28 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_kernel drivers/tty/vt/selection.c:357 [inline] #0: ffffffff8b56db28 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_user+0x81/0x180 drivers/tty/vt/selection.c:185 2 locks held by syz-executor.2/6238: #0: ffff88807d91e098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x1f/0x70 drivers/tty/tty_ldisc.c:244 #1: ffff8880724a70b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x109/0x450 drivers/tty/vt/selection.c:390 1 lock held by syz-executor.1/6293: #0: ffffffff8b56db28 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_kernel drivers/tty/vt/selection.c:357 [inline] #0: ffffffff8b56db28 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_user+0x81/0x180 drivers/tty/vt/selection.c:185 3 locks held by syz-executor.1/6294: #0: ffff888073dcc098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x1f/0x70 drivers/tty/tty_ldisc.c:244 #1: ffff8880223820b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x109/0x450 drivers/tty/vt/selection.c:390 #2: ffffffff8b56db28 (vc_sel.lock){+.+.}-{3:3}, at: paste_selection+0x13f/0x450 drivers/tty/vt/selection.c:393 1 lock held by syz-executor.4/6358: #0: ffffffff8b56db28 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_kernel drivers/tty/vt/selection.c:357 [inline] #0: ffffffff8b56db28 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_user+0x81/0x180 drivers/tty/vt/selection.c:185 2 locks held by syz-executor.4/6361: #0: ffff888078580098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x1f/0x70 drivers/tty/tty_ldisc.c:244 #1: ffff8880722ee0b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x109/0x450 drivers/tty/vt/selection.c:390 3 locks held by syz-executor.4/6359: #0: ffff888078580098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x1f/0x70 drivers/tty/tty_ldisc.c:244 #1: ffff8880722ee0b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x109/0x450 drivers/tty/vt/selection.c:390 #2: ffffffff8b56db28 (vc_sel.lock){+.+.}-{3:3}, at: paste_selection+0x13f/0x450 drivers/tty/vt/selection.c:393 1 lock held by syz-executor.3/6481: #0: ffffffff8b56db28 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_kernel drivers/tty/vt/selection.c:357 [inline] #0: ffffffff8b56db28 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_user+0x81/0x180 drivers/tty/vt/selection.c:185 2 locks held by syz-executor.3/6489: #0: ffff8880643ae098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x1f/0x70 drivers/tty/tty_ldisc.c:244 #1: ffff8880648550b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x109/0x450 drivers/tty/vt/selection.c:390 3 locks held by syz-executor.3/6482: #0: ffff8880643ae098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x1f/0x70 drivers/tty/tty_ldisc.c:244 #1: ffff8880648550b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x109/0x450 drivers/tty/vt/selection.c:390 #2: ffffffff8b56db28 (vc_sel.lock){+.+.}-{3:3}, at: paste_selection+0x13f/0x450 drivers/tty/vt/selection.c:393 2 locks held by dhcpcd/6656: #0: ffff888058b5a130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1668 [inline] #0: ffff888058b5a130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x27/0xa70 net/packet/af_packet.c:3174 #1: ffffffff8ab82168 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline] #1: ffffffff8ab82168 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x4fa/0x620 kernel/rcu/tree_exp.h:840 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.17.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x57/0x7d lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x30/0xc0 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x11f/0x170 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline] watchdog+0x88c/0xbf0 kernel/hung_task.c:369 kthread+0x299/0x340 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 10 Comm: kworker/u4:1 Not tainted 5.17.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:match_held_lock+0x1/0xc0 kernel/locking/lockdep.c:5085 Code: ee 48 c7 c7 e0 a6 cb 88 e8 a6 50 be ff 48 c7 c7 40 a7 cb 88 e8 9a 50 be ff e8 4f 29 ce ff 31 c0 5d c3 0f 1f 80 00 00 00 00 53 <48> 89 fb 48 83 ec 08 48 39 77 10 74 6a 66 f7 47 22 f0 ff 74 5a 48 RSP: 0018:ffffc90000cf7cd0 EFLAGS: 00000002 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8ab78460 RDI: ffff8880109126e0 RBP: ffffffff8ab78460 R08: 0000000000000000 R09: ffffffff8c837a57 R10: fffffbfff1906f4a R11: 0000000000000001 R12: ffff888010911cc0 R13: ffff8880109126e0 R14: 00000000ffffffff R15: ffff8880109126e0 FS: 0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd52e0d5600 CR3: 000000000a88e000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __lock_is_held kernel/locking/lockdep.c:5380 [inline] lock_is_held_type+0xa7/0x140 kernel/locking/lockdep.c:5682 lock_is_held include/linux/lockdep.h:283 [inline] rcu_read_lock_sched_held+0x3a/0x70 kernel/rcu/update.c:125 trace_workqueue_execute_end include/trace/events/workqueue.h:108 [inline] process_one_work+0xc8c/0x1410 kernel/workqueue.c:2312 worker_thread+0x5a0/0xf60 kernel/workqueue.c:2454 kthread+0x299/0x340 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: ee out %al,(%dx) 1: 48 c7 c7 e0 a6 cb 88 mov $0xffffffff88cba6e0,%rdi 8: e8 a6 50 be ff callq 0xffbe50b3 d: 48 c7 c7 40 a7 cb 88 mov $0xffffffff88cba740,%rdi 14: e8 9a 50 be ff callq 0xffbe50b3 19: e8 4f 29 ce ff callq 0xffce296d 1e: 31 c0 xor %eax,%eax 20: 5d pop %rbp 21: c3 retq 22: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 29: 53 push %rbx * 2a: 48 89 fb mov %rdi,%rbx <-- trapping instruction 2d: 48 83 ec 08 sub $0x8,%rsp 31: 48 39 77 10 cmp %rsi,0x10(%rdi) 35: 74 6a je 0xa1 37: 66 f7 47 22 f0 ff testw $0xfff0,0x22(%rdi) 3d: 74 5a je 0x99 3f: 48 rex.W