INFO: task kworker/u8:8:1056 blocked in I/O wait for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:8 state:D stack:20608 pid:1056 tgid:1056 ppid:2 task_flags:0x4248060 flags:0x00080000 Workqueue: writeback wb_workfn (flush-8:0) Call Trace: context_switch kernel/sched/core.c:5583 [inline] __schedule+0x17dd/0x5830 kernel/sched/core.c:7382 __schedule_loop kernel/sched/core.c:7459 [inline] schedule+0x164/0x2b0 kernel/sched/core.c:7474 io_schedule+0x7f/0xd0 kernel/sched/core.c:8146 rq_qos_wait+0x266/0x360 block/blk-rq-qos.c:307 __wbt_wait block/blk-wbt.c:598 [inline] wbt_wait+0x326/0x550 block/blk-wbt.c:658 __rq_qos_throttle+0x6b/0xb0 block/blk-rq-qos.c:66 rq_qos_throttle block/blk-rq-qos.h:164 [inline] blk_mq_get_new_requests block/blk-mq.c:3056 [inline] blk_mq_submit_bio+0x1697/0x2c40 block/blk-mq.c:3198 __submit_bio_noacct_mq block/blk-core.c:757 [inline] submit_bio_noacct_nocheck+0x2fe/0xb10 block/blk-core.c:791 blk_crypto_submit_bio include/linux/blk-crypto.h:212 [inline] ext4_io_submit fs/ext4/page-io.c:399 [inline] io_submit_add_bh fs/ext4/page-io.c:455 [inline] ext4_bio_write_folio+0x101a/0x18c0 fs/ext4/page-io.c:550 mpage_process_page_bufs+0x6bd/0x8a0 fs/ext4/inode.c:2327 mpage_prepare_extent_to_map+0xf8d/0x1880 fs/ext4/inode.c:2875 ext4_do_writepages+0xc08/0x44a0 fs/ext4/inode.c:3023 ext4_writepages+0x1fe/0x4e0 fs/ext4/inode.c:3171 do_writepages+0x338/0x560 mm/page-writeback.c:2562 __writeback_single_inode+0x136/0x1220 fs/fs-writeback.c:1809 writeback_sb_inodes+0x9de/0x1af0 fs/fs-writeback.c:2120 __writeback_inodes_wb+0x114/0x250 fs/fs-writeback.c:2196 wb_writeback+0x42f/0xad0 fs/fs-writeback.c:2307 wb_check_start_all fs/fs-writeback.c:2433 [inline] wb_do_writeback fs/fs-writeback.c:2480 [inline] wb_workfn+0x980/0x10f0 fs/fs-writeback.c:2518 process_one_work kernel/workqueue.c:3505 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3588 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3669 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 INFO: task syz-executor:5621 blocked in I/O wait for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:22152 pid:5621 tgid:5621 ppid:5620 task_flags:0x440100 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5583 [inline] __schedule+0x17dd/0x5830 kernel/sched/core.c:7382 __schedule_loop kernel/sched/core.c:7459 [inline] schedule+0x164/0x2b0 kernel/sched/core.c:7474 io_schedule+0x7f/0xd0 kernel/sched/core.c:8146 bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258 __wait_on_bit+0xac/0x300 kernel/sched/wait_bit.c:52 out_of_line_wait_on_bit+0x13b/0x190 kernel/sched/wait_bit.c:67 wait_on_bit_io include/linux/wait_bit.h:106 [inline] do_get_write_access+0x658/0x10c0 fs/jbd2/transaction.c:1113 jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263 __ext4_journal_get_write_access+0xec/0x620 fs/ext4/ext4_jbd2.c:253 ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:7451 __ext4_mark_inode_dirty+0x141/0x7e0 fs/ext4/inode.c:7642 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:7679 __mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2751 generic_update_time fs/inode.c:2264 [inline] file_update_time_flags+0x399/0x440 fs/inode.c:2494 ext4_page_mkwrite+0x21f/0x1470 fs/ext4/inode.c:7864 do_page_mkwrite+0x147/0x310 mm/memory.c:3889 wp_page_shared mm/memory.c:4295 [inline] do_wp_page+0x1a77/0x4c30 mm/memory.c:4518 handle_pte_fault mm/memory.c:6692 [inline] __handle_mm_fault mm/memory.c:6817 [inline] handle_mm_fault+0x19c9/0x2f80 mm/memory.c:6984 do_user_addr_fault+0xb35/0x1480 arch/x86/mm/fault.c:1343 handle_page_fault arch/x86/mm/fault.c:1483 [inline] exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 RIP: 0033:0x7f4c2be71a63 RSP: 002b:00007ffc633744c0 EFLAGS: 00010206 RAX: 00007f4c25bf09bc RBX: 00007ffc633745f0 RCX: 0000000000000000 RDX: 00007f4c25bf09b8 RSI: 0000000000000008 RDI: 00007ffc633745f0 RBP: 00000000000003e6 R08: 0000000000000000 R09: 0000000000000000 R10: 00007ffc633745d0 R11: 0000000000000000 R12: 0000000000000000 R13: 000000000000f644 R14: ffffffffffff09bc R15: 0000000000000000 INFO: task syz.0.168:6434 blocked in I/O wait for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.168 state:D stack:24776 pid:6434 tgid:6434 ppid:5631 task_flags:0x440040 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5583 [inline] __schedule+0x17dd/0x5830 kernel/sched/core.c:7382 __schedule_loop kernel/sched/core.c:7459 [inline] schedule+0x164/0x2b0 kernel/sched/core.c:7474 io_schedule+0x7f/0xd0 kernel/sched/core.c:8146 bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258 __wait_on_bit+0xac/0x300 kernel/sched/wait_bit.c:52 out_of_line_wait_on_bit+0x13b/0x190 kernel/sched/wait_bit.c:67 wait_on_bit_io include/linux/wait_bit.h:106 [inline] do_get_write_access+0x658/0x10c0 fs/jbd2/transaction.c:1113 jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263 __ext4_journal_get_write_access+0xec/0x620 fs/ext4/ext4_jbd2.c:253 ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:7451 __ext4_mark_inode_dirty+0x141/0x7e0 fs/ext4/inode.c:7642 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:7679 __mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2751 generic_update_time fs/inode.c:2264 [inline] file_update_time_flags+0x399/0x440 fs/inode.c:2494 ext4_page_mkwrite+0x21f/0x1470 fs/ext4/inode.c:7864 do_page_mkwrite+0x147/0x310 mm/memory.c:3889 do_shared_fault mm/memory.c:6188 [inline] do_fault mm/memory.c:6250 [inline] do_pte_missing+0x70f/0x3570 mm/memory.c:4778 handle_pte_fault mm/memory.c:6665 [inline] __handle_mm_fault mm/memory.c:6817 [inline] handle_mm_fault+0x1807/0x2f80 mm/memory.c:6984 do_user_addr_fault+0x7f6/0x1480 arch/x86/mm/fault.c:1394 handle_page_fault arch/x86/mm/fault.c:1483 [inline] exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 RIP: 0033:0x7f12a3a74111 RSP: 002b:00007ffd575fe140 EFLAGS: 00010202 RAX: 0000001b34c22548 RBX: ffffffffffffe548 RCX: ffffffff816dd53f RDX: 0000001b34c22544 RSI: 0000000000000004 RDI: 00007f12a4955720 RBP: 0000000000000000 R08: 00007f12a3e10000 R09: 00007f12a3e12000 R10: 00000000816dd543 R11: 0000000000000002 R12: 0000000000000000 R13: 0000000000016442 R14: ffffffff816ddefe R15: 00007f12a4955720 INFO: task syz.4.170:6440 blocked in I/O wait for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.170 state:D stack:24776 pid:6440 tgid:6440 ppid:5634 task_flags:0x440040 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5583 [inline] __schedule+0x17dd/0x5830 kernel/sched/core.c:7382 __schedule_loop kernel/sched/core.c:7459 [inline] schedule+0x164/0x2b0 kernel/sched/core.c:7474 io_schedule+0x7f/0xd0 kernel/sched/core.c:8146 bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258 __wait_on_bit+0xac/0x300 kernel/sched/wait_bit.c:52 out_of_line_wait_on_bit+0x13b/0x190 kernel/sched/wait_bit.c:67 wait_on_bit_io include/linux/wait_bit.h:106 [inline] do_get_write_access+0x658/0x10c0 fs/jbd2/transaction.c:1113 jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263 __ext4_journal_get_write_access+0xec/0x620 fs/ext4/ext4_jbd2.c:253 ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:7451 __ext4_mark_inode_dirty+0x141/0x7e0 fs/ext4/inode.c:7642 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:7679 __mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2751 generic_update_time fs/inode.c:2264 [inline] file_update_time_flags+0x399/0x440 fs/inode.c:2494 ext4_page_mkwrite+0x21f/0x1470 fs/ext4/inode.c:7864 do_page_mkwrite+0x147/0x310 mm/memory.c:3889 do_shared_fault mm/memory.c:6188 [inline] do_fault mm/memory.c:6250 [inline] do_pte_missing+0x70f/0x3570 mm/memory.c:4778 handle_pte_fault mm/memory.c:6665 [inline] __handle_mm_fault mm/memory.c:6817 [inline] handle_mm_fault+0x1807/0x2f80 mm/memory.c:6984 do_user_addr_fault+0xb35/0x1480 arch/x86/mm/fault.c:1343 handle_page_fault arch/x86/mm/fault.c:1483 [inline] exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 RIP: 0033:0x7f3bb7074111 RSP: 002b:00007fffb83581c0 EFLAGS: 00010202 RAX: 0000001b35024000 RBX: 0000000000000000 RCX: 00000000005ffde8 RDX: 0000001b35023ffc RSI: 00000000005ffde8 RDI: 00007f3bb7f55700 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007f3bb7412000 R10: 00007f3bb7f55700 R11: 0000000000000000 R12: 0000000000000000 R13: 000000000000d80a R14: ffffffff816ddefe R15: 00007f3bb7f55720 INFO: task syz.2.171:6442 blocked in I/O wait for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.171 state:D stack:25208 pid:6442 tgid:6442 ppid:5633 task_flags:0x440040 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5583 [inline] __schedule+0x17dd/0x5830 kernel/sched/core.c:7382 __schedule_loop kernel/sched/core.c:7459 [inline] schedule+0x164/0x2b0 kernel/sched/core.c:7474 io_schedule+0x7f/0xd0 kernel/sched/core.c:8146 bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258 __wait_on_bit+0xac/0x300 kernel/sched/wait_bit.c:52 out_of_line_wait_on_bit+0x13b/0x190 kernel/sched/wait_bit.c:67 wait_on_bit_io include/linux/wait_bit.h:106 [inline] do_get_write_access+0x658/0x10c0 fs/jbd2/transaction.c:1113 jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263 __ext4_journal_get_write_access+0xec/0x620 fs/ext4/ext4_jbd2.c:253 ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:7451 __ext4_mark_inode_dirty+0x141/0x7e0 fs/ext4/inode.c:7642 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:7679 __mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2751 generic_update_time fs/inode.c:2264 [inline] touch_atime+0x568/0x670 fs/inode.c:2339 file_accessed include/linux/fs.h:2283 [inline] ext4_file_mmap_prepare+0x277/0x450 fs/ext4/file.c:919 vfs_mmap_prepare include/linux/fs.h:2075 [inline] call_mmap_prepare mm/vma.c:2976 [inline] __mmap_region mm/vma.c:3093 [inline] mmap_region+0x1191/0x2820 mm/vma.c:3191 do_mmap+0xe0a/0x1300 mm/mmap.c:573 vm_mmap_pgoff+0x27a/0x520 mm/util.c:581 ksys_mmap_pgoff+0x4dc/0x760 mm/mmap.c:619 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1562b9f882 RSP: 002b:00007ffe411d8e18 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 0000001b34864000 RCX: 00007f1562b9f882 RDX: 0000000000000003 RSI: 00000000005c0000 RDI: 0000001b34864000 RBP: 0000000000100001 R08: 0000000000000004 R09: 0000000000040000 R10: 0000000000100001 R11: 0000000000000206 R12: 0000000000000026 R13: 00000000000927c0 R14: 000000000001b43c R15: 00007ffe411d90f0 Showing all locks held in the system: locks held by khungtaskd/35: 1, last CPU#0: #0: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline] #0: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6871 locks held by kworker/u8:8/1056: 4, on CPU#1: #0: ffff888021ec5150 ((wq_completion)writeback){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline] #0: ffff888021ec5150 ((wq_completion)writeback){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffff888021ec5150 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3470 [inline] #0: ffff888021ec5150 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3588 #1: ffffc90004e77c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline] #1: ffffc90004e77c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #1: ffffc90004e77c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3470 [inline] #1: ffffc90004e77c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3588 #2: ffff888036d2c100 (&type->s_umount_key#34){++++}-{4:4}, at: super_trylock_shared+0x23/0xf0 fs/super.c:642 #3: ffff888036d44cd8 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1f1/0x4e0 fs/ext4/inode.c:3170 locks held by getty/5389: 2, on CPU#1: #0: ffff88803841c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900032362e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360 drivers/tty/n_tty.c:2211 locks held by syz-executor/5621: 3, on CPU#1: #0: ffff8880752986c8 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:339 #1: ffff888036d2c570 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline] #1: ffff888036d2c570 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1fe/0x1470 fs/ext4/inode.c:7863 #2: ffff888036d2a950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444 locks held by syz.0.168/6434: 3, on CPU#1: #0: ffff88802e345900 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:635 [inline] #0: ffff88802e345900 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/mmap_lock.c:568 [inline] #0: ffff88802e345900 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x36/0x340 mm/mmap_lock.c:628 #1: ffff888036d2c570 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline] #1: ffff888036d2c570 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1fe/0x1470 fs/ext4/inode.c:7863 #2: ffff888036d2a950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444 locks held by syz.4.170/6440: 3, on CPU#0: #0: ffff888056ba0948 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:339 #1: ffff888036d2c570 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline] #1: ffff888036d2c570 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1fe/0x1470 fs/ext4/inode.c:7863 #2: ffff888036d2a950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444 locks held by syz.2.171/6442: 3, on CPU#0: #0: ffff8880799be540 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:566 [inline] #0: ffff8880799be540 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1ed/0x520 mm/util.c:579 #1: ffff888036d2c478 (sb_writers#4){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2283 [inline] #1: ffff888036d2c478 (sb_writers#4){.+.+}-{0:0}, at: ext4_file_mmap_prepare+0x277/0x450 fs/ext4/file.c:919 #2: ffff888036d2a950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 35 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:123 nmi_trigger_cpumask_backtrace+0x17d/0x390 lib/nmi_backtrace.c:66 trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline] __sys_info lib/sys_info.c:157 [inline] sys_info+0x135/0x170 lib/sys_info.c:165 check_hung_uninterruptible_tasks kernel/hung_task.c:377 [inline] watchdog+0x1073/0x10f0 kernel/hung_task.c:598 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64 Code: eb 8f 02 c3 cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 03 3b 21 00 fb f4 3c 17 03 00 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 RSP: 0018:ffffc900001c7e40 EFLAGS: 00000242 RAX: 00000000001217c1 RBX: ffffffff819cae20 RCX: 8000000000000001 RDX: 0000000000000001 RSI: ffffffff8e6ada39 RDI: ffffffff8c8eab80 RBP: ffffc900001c7f10 R08: ffff8880b8333d9b R09: 1ffff110170667b3 R10: dffffc0000000000 R11: ffffed10170667b4 R12: 0000000000000000 R13: 1ffff11003ed83e8 R14: 1ffff92000038fd0 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881234fb000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055ff1f419168 CR3: 000000000ff48000 CR4: 00000000003526f0 Call Trace: arch_safe_halt arch/x86/kernel/process.c:767 [inline] default_idle+0x9/0x20 arch/x86/kernel/process.c:768 default_idle_call+0x72/0xb0 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:199 [inline] do_idle+0x2e0/0x540 kernel/sched/idle.c:355 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:458 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312 common_startup_64+0x13e/0x157