INFO: task syz-executor.3:9410 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D24408 9410 30679 0x00000004 tc_dump_action: action bad kind Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 wb_wait_for_completion+0x175/0x1f0 fs/fs-writeback.c:222 sync_inodes_sb+0x19d/0x9a0 fs/fs-writeback.c:2459 sync_inodes_one_sb+0x4d/0x60 fs/sync.c:74 iterate_supers+0x13c/0x290 fs/super.c:633 ksys_sync+0x86/0x150 fs/sync.c:113 __ia32_sys_sync+0xa/0x10 fs/sync.c:124 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f544707d5a9 Code: Bad RIP value. RSP: 002b:00007f54455f0168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f544719df80 RCX: 00007f544707d5a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f54470d87b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffec08aa18f R14: 00007f54455f0300 R15: 0000000000022000 INFO: task syz-executor.3:9420 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. tc_dump_action: action bad kind syz-executor.3 D27712 9420 30679 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 tc_dump_action: action bad kind schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1016 [inline] __mutex_lock+0x5f0/0x1190 kernel/locking/mutex.c:1078 netlink: 3668 bytes leftover after parsing attributes in process `syz-executor.4'. f2fs_balance_fs+0x709/0xd80 fs/f2fs/segment.c:512 audit: type=1800 audit(1667204168.382:672): pid=16171 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="bus" dev="sda1" ino=14003 res=0 f2fs_write_begin+0x1c14/0x3870 fs/f2fs/data.c:2404 generic_perform_write+0x1f8/0x4d0 mm/filemap.c:3170 __generic_file_write_iter+0x24b/0x610 mm/filemap.c:3295 f2fs_file_write_iter+0x3c4/0xbe0 fs/f2fs/file.c:3031 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x51b/0x770 fs/read_write.c:487 vfs_write+0x1f3/0x540 fs/read_write.c:549 ksys_write+0x12b/0x2a0 fs/read_write.c:599 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f544707d5a9 Code: Bad RIP value. RSP: 002b:00007f54455cf168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f544719e050 RCX: 00007f544707d5a9 RDX: 000000000208e24b RSI: 00000000200003c0 RDI: 0000000000000004 RBP: 00007f54470d87b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffec08aa18f R14: 00007f54455cf300 R15: 0000000000022000 INFO: task syz-executor.3:9421 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28256 9421 30679 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1016 [inline] __mutex_lock+0x5f0/0x1190 kernel/locking/mutex.c:1078 f2fs_balance_fs+0x709/0xd80 fs/f2fs/segment.c:512 f2fs_setattr+0x5b6/0x12b0 fs/f2fs/file.c:852 notify_change+0x70b/0xfc0 fs/attr.c:334 do_truncate+0x134/0x1f0 fs/open.c:63 handle_truncate fs/namei.c:3009 [inline] do_last fs/namei.c:3427 [inline] path_openat+0x2308/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f544707d5a9 Code: Bad RIP value. RSP: 002b:00007f54455ae168 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007f544719e120 RCX: 00007f544707d5a9 RDX: 0000000000000000 RSI: 00000000000e8b42 RDI: 00000000200005c0 RBP: 00007f54470d87b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffec08aa18f R14: 00007f54455ae300 R15: 0000000000022000 INFO: task syz-executor.3:9423 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D30272 9423 30679 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x3aa/0x760 kernel/locking/rwsem-xadd.c:618 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:72 bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] sync_inodes_sb+0x180/0x9a0 fs/fs-writeback.c:2457 sync_inodes_one_sb+0x4d/0x60 fs/sync.c:74 iterate_supers+0x13c/0x290 fs/super.c:633 ksys_sync+0x86/0x150 fs/sync.c:113 __ia32_sys_sync+0xa/0x10 fs/sync.c:124 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f544707d5a9 Code: Bad RIP value. RSP: 002b:00007f544556c168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f544719e2c0 RCX: 00007f544707d5a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f54470d87b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffec08aa18f R14: 00007f544556c300 R15: 0000000000022000 INFO: task syz-executor.3:9424 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29120 9424 30679 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 netlink: 3608 bytes leftover after parsing attributes in process `syz-executor.4'. tc_dump_action: action bad kind schedule+0x8d/0x1b0 kernel/sched/core.c:3561 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x3aa/0x760 kernel/locking/rwsem-xadd.c:618 tc_dump_action: action bad kind call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:748 [inline] process_measurement+0x1415/0x1440 security/integrity/ima/ima_main.c:205 ima_file_check+0xb9/0x100 security/integrity/ima/ima_main.c:391 do_last fs/namei.c:3425 [inline] path_openat+0x7e4/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f544707d5a9 Code: Bad RIP value. RSP: 002b:00007f544554b168 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007f544719e390 RCX: 00007f544707d5a9 RDX: 0000000000000000 RSI: 00000000000e8b42 RDI: 0000000020000180 RBP: 00007f54470d87b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffec08aa18f R14: 00007f544554b300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by ksoftirqd/1/18: 2 locks held by kworker/u4:2/33: #0: 00000000713c3742 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline] #0: 00000000713c3742 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455 #1: 00000000d66c4801 (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:428 [inline] #1: 00000000d66c4801 (rcu_read_lock){....}, at: update_curr+0x2c3/0x870 kernel/sched/fair.c:857 4 locks held by kworker/u4:3/184: 1 lock held by khungtaskd/1571: #0: 00000000d66c4801 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 tc_dump_action: action bad kind 2 locks held by agetty/8024: #0: 000000003bdee354 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 0000000029e86a8d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1950 drivers/tty/n_tty.c:2154 2 locks held by syz-executor.3/9410: #0: 000000004a452e82 (&type->s_umount_key#85){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 #1: 00000000a2e7adc2 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 00000000a2e7adc2 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x180/0x9a0 fs/fs-writeback.c:2457 4 locks held by syz-executor.3/9420: #0: 000000008aeb3e0f (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 #1: 0000000083413562 (sb_writers#22){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline] #1: 0000000083413562 (sb_writers#22){.+.+}, at: vfs_write+0x463/0x540 fs/read_write.c:548 #2: 0000000020586f99 (&sb->s_type->i_mutex_key#29){+.+.}, at: inode_trylock include/linux/fs.h:768 [inline] #2: 0000000020586f99 (&sb->s_type->i_mutex_key#29){+.+.}, at: f2fs_file_write_iter+0x1b6/0xbe0 fs/f2fs/file.c:2993 #3: 00000000a35bffe5 (&sbi->gc_mutex){+.+.}, at: f2fs_balance_fs+0x709/0xd80 fs/f2fs/segment.c:512 3 locks held by syz-executor.3/9421: #0: 0000000083413562 (sb_writers#22){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 0000000083413562 (sb_writers#22){.+.+}, at: mnt_want_write+0x3a/0xb0 fs/namespace.c:360 #1: 00000000ba7f6410 (&sb->s_type->i_mutex_key#29){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #1: 00000000ba7f6410 (&sb->s_type->i_mutex_key#29){+.+.}, at: do_truncate+0x125/0x1f0 fs/open.c:61 #2: 00000000a35bffe5 (&sbi->gc_mutex){+.+.}, at: f2fs_balance_fs+0x709/0xd80 fs/f2fs/segment.c:512 2 locks held by syz-executor.3/9423: #0: 000000004a452e82 (&type->s_umount_key#85){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 netlink: 3708 bytes leftover after parsing attributes in process `syz-executor.4'. #1: 00000000a2e7adc2 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 00000000a2e7adc2 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x180/0x9a0 fs/fs-writeback.c:2457 tc_dump_action: action bad kind 2 locks held by syz-executor.3/9424: #0: 0000000083413562 (sb_writers#22){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 0000000083413562 (sb_writers#22){.+.+}, at: mnt_want_write+0x3a/0xb0 fs/namespace.c:360 #1: 00000000ba7f6410 (&sb->s_type->i_mutex_key#29){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #1: 00000000ba7f6410 (&sb->s_type->i_mutex_key#29){+.+.}, at: process_measurement+0x1415/0x1440 security/integrity/ima/ima_main.c:205 3 locks held by syz-executor.3/13371: netlink: 3668 bytes leftover after parsing attributes in process `syz-executor.4'. #0: 00000000713c3742 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline] #0: 00000000713c3742 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455 #1: 00000000d66c4801 (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:428 [inline] #1: 00000000d66c4801 (rcu_read_lock){....}, at: update_curr+0x2c3/0x870 kernel/sched/fair.c:857 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. #2: 00000000d66c4801 (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:428 [inline] #2: 00000000d66c4801 (rcu_read_lock){....}, at: update_curr+0x2c3/0x870 kernel/sched/fair.c:857 2 locks held by syz-executor.2/16263: 3 locks held by syz-executor.5/16269: audit: type=1800 audit(1667204170.872:673): pid=16269 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="file0" dev="sda1" ino=15825 res=0 netlink: 3608 bytes leftover after parsing attributes in process `syz-executor.4'. #0: 00000000a702d5b5 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline] #0: 00000000a702d5b5 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455 #1: 00000000d771f71e (&ctx->lock){-.-.}, at: perf_event_context_sched_out kernel/events/core.c:3145 [inline] #1: 00000000d771f71e (&ctx->lock){-.-.}, at: __perf_event_task_sched_out+0xa49/0x1470 kernel/events/core.c:3237 #2: 00000000e77393a2 (hrtimer_bases.lock){-.-.}, at: lock_hrtimer_base kernel/time/hrtimer.c:174 [inline] #2: 00000000e77393a2 (hrtimer_bases.lock){-.-.}, at: hrtimer_try_to_cancel.part.0+0x6e/0x560 kernel/time/hrtimer.c:1214 netlink: 2832 bytes leftover after parsing attributes in process `syz-executor.4'. 1 lock held by syz-executor.5/16292: #0: 000000001126d691 (&iint->mutex){+.+.}, at: process_measurement+0x316/0x1440 security/integrity/ima/ima_main.c:224 1 lock held by syz-executor.0/16262: 2 locks held by syz-executor.3/16290: #0: 00000000a702d5b5 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline] #0: 00000000a702d5b5 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455 #1: 00000000d66c4801 (rcu_read_lock){....}, at: rmqueue mm/page_alloc.c:3047 [inline] #1: 00000000d66c4801 (rcu_read_lock){....}, at: get_page_from_freelist+0x1d60/0x4170 mm/page_alloc.c:3373 2 locks held by syz-executor.0/16295: #0: 00000000713c3742 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline] #0: 00000000713c3742 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.4'. #1: 00000000d66c4801 (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:428 [inline] #1: 00000000d66c4801 (rcu_read_lock){....}, at: update_curr+0x2c3/0x870 kernel/sched/fair.c:857 1 lock held by systemd-udevd/16301: #0: 00000000a702d5b5 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline] #0: 00000000a702d5b5 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455 1 lock held by systemd-udevd/16305: 2 locks held by systemd-udevd/16307: #0: 00000000a702d5b5 (&rq->lock){-.-.}, at: idle_balance kernel/sched/fair.c:9702 [inline] #0: 00000000a702d5b5 (&rq->lock){-.-.}, at: pick_next_task_fair+0x556/0x1570 kernel/sched/fair.c:6841 #1: 00000000d66c4801 (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:428 [inline] #1: 00000000d66c4801 (rcu_read_lock){....}, at: update_curr+0x2c3/0x870 kernel/sched/fair.c:857 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1571 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 33 Comm: kworker/u4:2 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 Workqueue: phy39 ieee80211_iface_work RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:149 [inline] RIP: 0010:unwind_next_frame+0x24a/0x1400 arch/x86/kernel/unwind_orc.c:422 Code: 8d 43 ff 39 c6 0f 83 06 0e 00 00 48 b8 00 00 00 00 00 fc ff df 89 f2 48 8d 3c 95 bc 91 17 8c 48 89 f9 48 c1 e9 03 0f b6 0c 01 <48> 89 f8 83 e0 07 83 c0 03 38 c8 7c 27 84 c9 74 23 48 89 54 24 30 RSP: 0018:ffff8880b50eef38 EFLAGS: 00000a06 RAX: dffffc0000000000 RBX: 1ffff11016a1ddf0 RCX: 0000000000000000 RDX: 00000000000022ef RSI: 00000000000022ef RDI: ffffffff8c181d78 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000001 R10: ffff8880b50ef17f R11: 0000000000074071 R12: ffff8880b50ef168 R13: ffff8880b50ef155 R14: ffff8880b50ef120 R15: ffffffff8122efe1 FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5211969000 CR3: 00000000a2c0e000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __unwind_start+0x5b8/0x960 arch/x86/kernel/unwind_orc.c:667 unwind_start arch/x86/include/asm/unwind.h:60 [inline] __save_stack_trace+0x72/0x190 arch/x86/kernel/stacktrace.c:43 save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:553 __do_kmalloc mm/slab.c:3727 [inline] __kmalloc+0x15a/0x3c0 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] kzalloc include/linux/slab.h:709 [inline] cfg80211_inform_bss_frame_data+0x200/0xeb0 net/wireless/scan.c:1255 ieee80211_bss_info_update+0x42d/0x1800 net/mac80211/scan.c:105 ieee80211_rx_bss_info net/mac80211/ibss.c:1125 [inline] ieee80211_rx_mgmt_probe_beacon+0xb4f/0x15c0 net/mac80211/ibss.c:1607 ieee80211_ibss_rx_queued_mgmt+0xe27/0x18b0 net/mac80211/ibss.c:1634 ieee80211_iface_work+0x5c4/0x8a0 net/mac80211/iface.c:1341 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415