INFO: task jbd2/sda1-8:2937 blocked for more than 143 seconds. Not tainted 5.16.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:jbd2/sda1-8 state:D stack:26512 pid: 2937 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 jbd2_journal_commit_transaction+0x89e/0x6be0 fs/jbd2/commit.c:496 kjournald2+0x1d0/0x930 fs/jbd2/journal.c:213 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 INFO: task syz-executor.2:32276 blocked for more than 143 seconds. Not tainted 5.16.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:23968 pid:32276 ppid: 1 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 wait_transaction_locked+0x1c8/0x250 fs/jbd2/transaction.c:183 add_transaction_credits+0x10f/0xb70 fs/jbd2/transaction.c:246 start_this_handle+0x39e/0x1380 fs/jbd2/transaction.c:427 jbd2__journal_start+0x399/0x930 fs/jbd2/transaction.c:525 __ext4_journal_start_sb+0x227/0x4a0 fs/ext4/ext4_jbd2.c:105 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_dirty_inode+0x9d/0x110 fs/ext4/inode.c:5916 __mark_inode_dirty+0x45b/0xfe0 fs/fs-writeback.c:2399 generic_update_time fs/inode.c:1782 [inline] inode_update_time fs/inode.c:1795 [inline] touch_atime+0x63d/0x700 fs/inode.c:1867 file_accessed include/linux/fs.h:2505 [inline] iterate_dir+0x465/0x700 fs/readdir.c:70 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64 fs/readdir.c:354 [inline] __x64_sys_getdents64+0x13a/0x2c0 fs/readdir.c:354 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: 0033:0x7f78ad14bca7 RSP: 002b:00007fff65457438 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 0000555555d7f810 RCX: 00007f78ad14bca7 RDX: 0000000000008000 RSI: 0000555555d7f840 RDI: 0000000000000003 RBP: 0000555555d7f840 R08: 0000000000000030 R09: 00007f78ad20c640 R10: 0000000000000231 R11: 0000000000000293 R12: ffffffffffffffbc R13: 0000555555d7f814 R14: 0000000000000016 R15: 00007fff65458630 INFO: task syz-executor.0:32447 blocked for more than 143 seconds. Not tainted 5.16.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:23984 pid:32447 ppid: 1 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 wait_transaction_locked+0x1c8/0x250 fs/jbd2/transaction.c:183 add_transaction_credits+0x10f/0xb70 fs/jbd2/transaction.c:246 start_this_handle+0x39e/0x1380 fs/jbd2/transaction.c:427 jbd2__journal_start+0x399/0x930 fs/jbd2/transaction.c:525 __ext4_journal_start_sb+0x227/0x4a0 fs/ext4/ext4_jbd2.c:105 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_dirty_inode+0x9d/0x110 fs/ext4/inode.c:5916 __mark_inode_dirty+0x45b/0xfe0 fs/fs-writeback.c:2399 generic_update_time fs/inode.c:1782 [inline] inode_update_time fs/inode.c:1795 [inline] touch_atime+0x63d/0x700 fs/inode.c:1867 file_accessed include/linux/fs.h:2505 [inline] iterate_dir+0x465/0x700 fs/readdir.c:70 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64 fs/readdir.c:354 [inline] __x64_sys_getdents64+0x13a/0x2c0 fs/readdir.c:354 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: 0033:0x7fa1e9f13ca7 RSP: 002b:00007fff22555d18 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 000055555729c810 RCX: 00007fa1e9f13ca7 RDX: 0000000000008000 RSI: 000055555729c840 RDI: 0000000000000003 RBP: 000055555729c840 R08: 0000000000000030 R09: 00007fa1e9fd4640 R10: 0000000000000231 R11: 0000000000000293 R12: ffffffffffffffbc R13: 000055555729c814 R14: 0000000000000016 R15: 00007fff22556f10 INFO: task syz-executor.5:32687 blocked for more than 144 seconds. Not tainted 5.16.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:24328 pid:32687 ppid: 1 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 wait_transaction_locked+0x1c8/0x250 fs/jbd2/transaction.c:183 add_transaction_credits+0x10f/0xb70 fs/jbd2/transaction.c:246 start_this_handle+0x39e/0x1380 fs/jbd2/transaction.c:427 jbd2__journal_start+0x399/0x930 fs/jbd2/transaction.c:525 __ext4_journal_start_sb+0x227/0x4a0 fs/ext4/ext4_jbd2.c:105 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_dirty_inode+0x9d/0x110 fs/ext4/inode.c:5916 __mark_inode_dirty+0x45b/0xfe0 fs/fs-writeback.c:2399 generic_update_time fs/inode.c:1782 [inline] inode_update_time fs/inode.c:1795 [inline] touch_atime+0x63d/0x700 fs/inode.c:1867 file_accessed include/linux/fs.h:2505 [inline] iterate_dir+0x465/0x700 fs/readdir.c:70 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64 fs/readdir.c:354 [inline] __x64_sys_getdents64+0x13a/0x2c0 fs/readdir.c:354 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: 0033:0x7fe790e09ca7 RSP: 002b:00007ffe040ccda8 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 000055555700e810 RCX: 00007fe790e09ca7 RDX: 0000000000008000 RSI: 000055555700e840 RDI: 0000000000000003 RBP: 000055555700e840 R08: 0000000000000030 R09: 00007fe790eca640 R10: 0000000000000231 R11: 0000000000000293 R12: ffffffffffffffbc R13: 000055555700e814 R14: 0000000000000016 R15: 00007ffe040cdfa0 INFO: task syz-executor.3:25273 blocked for more than 144 seconds. Not tainted 5.16.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:28152 pid:25273 ppid: 6488 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 wait_transaction_locked+0x1c8/0x250 fs/jbd2/transaction.c:183 add_transaction_credits+0x10f/0xb70 fs/jbd2/transaction.c:246 start_this_handle+0x39e/0x1380 fs/jbd2/transaction.c:427 jbd2__journal_start+0x399/0x930 fs/jbd2/transaction.c:525 __ext4_journal_start_sb+0x227/0x4a0 fs/ext4/ext4_jbd2.c:105 __ext4_new_inode+0x2cca/0x5ba0 fs/ext4/ialloc.c:1080 ext4_symlink+0x485/0xd40 fs/ext4/namei.c:3293 vfs_symlink fs/namei.c:4248 [inline] vfs_symlink+0x45d/0x6c0 fs/namei.c:4233 do_symlinkat+0x261/0x2e0 fs/namei.c:4277 __do_sys_symlink fs/namei.c:4299 [inline] __se_sys_symlink fs/namei.c:4297 [inline] __x64_sys_symlink+0x75/0x90 fs/namei.c:4297 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: 0033:0x7f9e491dc7a7 RSP: 002b:00007ffed13755e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9e491dc7a7 RDX: 00007ffed13756c7 RSI: 00007f9e4923709d RDI: 00007ffed13756b0 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffed1375480 R10: 00007ffed1375337 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffed13756b0 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8bb81320 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458 2 locks held by getty/3286: #0: ffff88807ed21098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:252 #1: ffffc90002b8e2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2113 2 locks held by syz-executor.4/7181: #0: ffff88804d005970 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: iterate_dir+0xcd/0x700 fs/readdir.c:55 #1: ffff88807ed7c460 (sb_writers#6){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2505 [inline] #1: ffff88807ed7c460 (sb_writers#6){.+.+}-{0:0}, at: iterate_dir+0x465/0x700 fs/readdir.c:70 1 lock held by syz-executor.3/7770: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 1 lock held by syz-executor.3/7790: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 1 lock held by syz-executor.3/7801: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 1 lock held by syz-executor.3/7863: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 1 lock held by syz-executor.3/8386: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 1 lock held by syz-executor.3/8404: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 1 lock held by syz-executor.3/8411: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 1 lock held by syz-executor.3/11928: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 1 lock held by syz-executor.3/20858: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 1 lock held by syz-executor.3/20880: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 1 lock held by syz-executor.3/20912: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 1 lock held by syz-executor.3/26544: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 1 lock held by syz-executor.3/26661: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 1 lock held by syz-executor.3/26685: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 1 lock held by syz-executor.3/26961: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 1 lock held by syz-executor.3/26966: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 1 lock held by syz-executor.3/27035: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 1 lock held by syz-executor.3/28105: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 1 lock held by syz-executor.3/30340: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 1 lock held by syz-executor.3/30350: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 1 lock held by syz-executor.3/30458: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 2 locks held by syz-executor.2/32276: #0: ffff88804d37b7b0 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: iterate_dir+0xcd/0x700 fs/readdir.c:55 #1: ffff88807ed7c460 (sb_writers#6){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2505 [inline] #1: ffff88807ed7c460 (sb_writers#6){.+.+}-{0:0}, at: iterate_dir+0x465/0x700 fs/readdir.c:70 3 locks held by syz-executor.1/32278: 2 locks held by syz-executor.0/32447: #0: ffff8880558a4470 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: iterate_dir+0xcd/0x700 fs/readdir.c:55 #1: ffff88807ed7c460 (sb_writers#6){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2505 [inline] #1: ffff88807ed7c460 (sb_writers#6){.+.+}-{0:0}, at: iterate_dir+0x465/0x700 fs/readdir.c:70 2 locks held by syz-executor.5/32687: #0: ffff88804d1e27f0 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: iterate_dir+0xcd/0x700 fs/readdir.c:55 #1: ffff88807ed7c460 (sb_writers#6){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2505 [inline] #1: ffff88807ed7c460 (sb_writers#6){.+.+}-{0:0}, at: iterate_dir+0x465/0x700 fs/readdir.c:70 1 lock held by syz-executor.3/1979: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 1 lock held by syz-executor.3/1988: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 1 lock held by syz-executor.3/2067: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 1 lock held by syz-executor.3/2084: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 1 lock held by syz-executor.3/2739: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 1 lock held by syz-executor.3/2944: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 4 locks held by kworker/u4:13/11150: #0: ffff888142dad938 ((wq_completion)writeback){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888142dad938 ((wq_completion)writeback){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888142dad938 ((wq_completion)writeback){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline] #0: ffff888142dad938 ((wq_completion)writeback){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:635 [inline] #0: ffff888142dad938 ((wq_completion)writeback){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:662 [inline] #0: ffff888142dad938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2269 #1: ffffc900050e7db0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2273 #2: ffff88807ed7c0e0 (&type->s_umount_key#52){++++}-{3:3}, at: trylock_super+0x1d/0x100 fs/super.c:418 #3: ffff88807ed7ebd8 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x1ab/0x690 mm/page-writeback.c:2364 1 lock held by syz-executor.3/11241: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 1 lock held by syz-executor.3/11249: #0: ffff88807ed7c650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:590 2 locks held by syz-executor.3/25273: #0: ffff88807ed7c460 (sb_writers#6){.+.+}-{0:0}, at: filename_create+0xf3/0x480 fs/namei.c:3649 #1: ffff88804d0265b0 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:818 [inline] #1: ffff88804d0265b0 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: filename_create+0x158/0x480 fs/namei.c:3654 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.16.0-rc6-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+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xc1d/0xf50 kernel/hung_task.c:295 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 32238 Comm: kworker/0:26 Not tainted 5.16.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_power_efficient fb_flashcursor RIP: 0010:slow_down_io arch/x86/include/asm/paravirt.h:55 [inline] RIP: 0010:inb_p arch/x86/include/asm/io.h:334 [inline] RIP: 0010:vga_io_r include/video/vga.h:204 [inline] RIP: 0010:vga_io_rgfx include/video/vga.h:389 [inline] RIP: 0010:setmode drivers/video/fbdev/vga16fb.c:124 [inline] RIP: 0010:vga_imageblit_expand drivers/video/fbdev/vga16fb.c:1171 [inline] RIP: 0010:vga16fb_imageblit+0xc5f/0x2aa0 drivers/video/fbdev/vga16fb.c:1260 Code: 80 3c 02 00 0f 85 58 1c 00 00 48 83 3d 39 24 84 07 00 0f 84 e0 15 00 00 e8 de 7b 5b fd e8 c9 10 18 fd 66 90 ba cf 03 00 00 ec <48> b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 80 3c 02 00 0f RSP: 0018:ffffc900047d7a30 EFLAGS: 00000293 RAX: 00000000000000ff RBX: ffffffff8b9f8060 RCX: 0000000000000000 RDX: 00000000000003cf RSI: ffffffff841b5c32 RDI: ffff888018d37f94 RBP: ffff888018d37f80 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff841b5803 R11: 0000000000000001 R12: 0000000000000007 R13: 0000000000000001 R14: ffff888018d37fa0 R15: ffff888018d43000 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe0960c7990 CR3: 000000000b88e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: soft_cursor+0x514/0xa30 drivers/video/fbdev/core/softcursor.c:74 bit_cursor+0x11b4/0x1760 drivers/video/fbdev/core/bitblit.c:362 fb_flashcursor+0x38b/0x430 drivers/video/fbdev/core/fbcon.c:377 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 4: 0f 85 58 1c 00 00 jne 0x1c62 a: 48 83 3d 39 24 84 07 cmpq $0x0,0x7842439(%rip) # 0x784244b 11: 00 12: 0f 84 e0 15 00 00 je 0x15f8 18: e8 de 7b 5b fd callq 0xfd5b7bfb 1d: e8 c9 10 18 fd callq 0xfd1810eb 22: 66 90 xchg %ax,%ax 24: ba cf 03 00 00 mov $0x3cf,%edx 29: ec in (%dx),%al * 2a: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax <-- trapping instruction 31: fc ff df 34: 48 89 da mov %rbx,%rdx 37: 48 c1 ea 03 shr $0x3,%rdx 3b: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 3f: 0f .byte 0xf