Hello, syzbot found the following issue on: HEAD commit: 5bd7ef53ffe5 Merge tag 'pull-fixes' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1661ea92e80000 kernel config: https://syzkaller.appspot.com/x/.config?x=e043d554f0a5f852 dashboard link: https://syzkaller.appspot.com/bug?extid=20e9a5e0dd424a875f55 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10c80dc1e80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1581aee6e80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/29942596057f/disk-5bd7ef53.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/bb808f8abb6b/vmlinux-5bd7ef53.xz kernel image: https://storage.googleapis.com/syzbot-assets/da472273df77/bzImage-5bd7ef53.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+20e9a5e0dd424a875f55@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task udevd:5097 blocked for more than 143 seconds. Not tainted 6.7.0-rc5-syzkaller-00047-g5bd7ef53ffe5 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:udevd state:D stack:26112 pid:5097 tgid:5097 ppid:4521 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:5376 [inline] __schedule+0xedb/0x5af0 kernel/sched/core.c:6688 __schedule_loop kernel/sched/core.c:6763 [inline] schedule+0xe9/0x270 kernel/sched/core.c:6778 io_schedule+0xbe/0x130 kernel/sched/core.c:8998 folio_wait_bit_common+0x3dc/0x9c0 mm/filemap.c:1273 __folio_lock mm/filemap.c:1611 [inline] folio_lock include/linux/pagemap.h:1031 [inline] folio_lock include/linux/pagemap.h:1027 [inline] __filemap_get_folio+0x633/0xaa0 mm/filemap.c:1864 truncate_inode_pages_range+0x3a0/0xf00 mm/truncate.c:376 kill_bdev block/bdev.c:76 [inline] blkdev_flush_mapping+0x14d/0x310 block/bdev.c:632 blkdev_put_whole+0xb9/0xe0 block/bdev.c:663 blkdev_put+0x40f/0x8e0 block/bdev.c:944 bdev_release+0x4f/0x80 block/bdev.c:954 blkdev_release+0x37/0x50 block/fops.c:616 __fput+0x270/0xbb0 fs/file_table.c:394 task_work_run+0x14d/0x240 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa92/0x2ae0 kernel/exit.c:871 do_group_exit+0xd4/0x2a0 kernel/exit.c:1021 get_signal+0x23be/0x2790 kernel/signal.c:2904 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x121/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1e/0x60 kernel/entry/common.c:296 do_syscall_64+0x4d/0x110 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7ff86c77f9a4 RSP: 002b:00007ffde3c9a490 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: 0000000000000008 RBX: 0000563006ab5550 RCX: 00007ff86c77f9a4 RDX: 00000000000a0800 RSI: 0000563006aaa4a0 RDI: 00000000ffffff9c RBP: 0000563006aaa4a0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800 R13: 0000563006aa26f0 R14: 0000000000000001 R15: 0000563006a90910 </TASK> INFO: task syz-executor383:5344 blocked for more than 143 seconds. Not tainted 6.7.0-rc5-syzkaller-00047-g5bd7ef53ffe5 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor383 state:D stack:28464 pid:5344 tgid:5343 ppid:5096 flags:0x00000006 Call Trace: <TASK> context_switch kernel/sched/core.c:5376 [inline] __schedule+0xedb/0x5af0 kernel/sched/core.c:6688 __schedule_loop kernel/sched/core.c:6763 [inline] schedule+0xe9/0x270 kernel/sched/core.c:6778 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6835 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0x5b9/0x9d0 kernel/locking/mutex.c:747 blkdev_get_by_dev.part.0+0x4ea/0xb10 block/bdev.c:788 blkdev_get_by_dev block/bdev.c:853 [inline] bdev_open_by_dev+0x166/0x1c0 block/bdev.c:842 blkdev_open+0xe6/0x390 block/fops.c:600 do_dentry_open+0x8d6/0x18c0 fs/open.c:948 do_open fs/namei.c:3622 [inline] path_openat+0x1e5a/0x2c50 fs/namei.c:3779 do_filp_open+0x1de/0x430 fs/namei.c:3809 do_sys_openat2+0x176/0x1e0 fs/open.c:1440 do_sys_open fs/open.c:1455 [inline] __do_sys_openat fs/open.c:1471 [inline] __se_sys_openat fs/open.c:1466 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1466 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f0da6256530 RSP: 002b:00007f0da6214d90 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0da6256530 RDX: 0000000000000000 RSI: 00007f0da6214e10 RDI: 00000000ffffff9c RBP: 00007f0da6214e10 R08: 0000000000000000 R09: 002364626e2f7665 R10: 0000000000000000 R11: 0000000000000293 R12: 6666666666666667 R13: 00007f0da62ab1a4 R14: 64626e2f7665642f R15: 00007fff62c3be28 </TASK> Showing all locks held in the system: 1 lock held by khungtaskd/28: #0: ffffffff8cfabce0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline] #0: ffffffff8cfabce0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline] #0: ffffffff8cfabce0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6614 2 locks held by getty/4828: #0: ffff88802a0ca0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc6/0x1490 drivers/tty/n_tty.c:2201 1 lock held by udevd/5097: #0: ffff888140f7d4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xb0/0x8e0 block/bdev.c:930 1 lock held by syz-executor383/5344: #0: ffff888140f7d4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x4ea/0xb10 block/bdev.c:788 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.7.0-rc5-syzkaller-00047-g5bd7ef53ffe5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x277/0x390 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x299/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xf87/0x1210 kernel/hung_task.c:379 kthread+0x2c6/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 </TASK> Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 1051 Comm: kworker/u4:6 Not tainted 6.7.0-rc5-syzkaller-00047-g5bd7ef53ffe5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:__default_send_IPI_dest_field+0x70/0xf0 arch/x86/kernel/apic/ipi.c:186 Code: 0f b6 03 84 c0 74 04 3c 03 7e 7c 8b 04 25 00 c3 5f ff f6 c4 10 75 e7 44 89 24 25 10 c3 5f ff 89 f0 09 e8 89 04 25 00 c3 5f ff <48> 83 c4 08 5b 5d 41 5c c3 bb e8 03 00 00 eb 16 65 ff 05 f9 0f cc RSP: 0018:ffffc900045b78f0 EFLAGS: 00000002 RAX: 00000000000008fb RBX: fffffbffffebf860 RCX: ffffffff818e47cb RDX: 0000000000000800 RSI: 00000000000000fb RDI: 0000000002000000 RBP: 0000000000000800 R08: 0000000000000000 R09: fffffbfff1e32882 R10: ffffffff8f194417 R11: 0000000000000006 R12: 0000000002000000 R13: ffffffff817be6d0 R14: 0000000000000001 R15: ffff8880b983d8c0 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005584e8069600 CR3: 000000000cd77000 CR4: 0000000000350ef0 Call Trace: <NMI> </NMI> <TASK> _flat_send_IPI_mask+0x40/0x70 arch/x86/kernel/apic/apic_flat_64.c:36 arch_send_call_function_single_ipi arch/x86/include/asm/smp.h:101 [inline] send_call_function_single_ipi kernel/smp.c:117 [inline] smp_call_function_many_cond+0x12cf/0x1550 kernel/smp.c:837 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1023 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:2006 [inline] text_poke_bp_batch+0x561/0x750 arch/x86/kernel/alternative.c:2299 text_poke_flush arch/x86/kernel/alternative.c:2407 [inline] text_poke_flush arch/x86/kernel/alternative.c:2404 [inline] text_poke_finish+0x30/0x40 arch/x86/kernel/alternative.c:2414 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 jump_label_update+0x1d7/0x400 kernel/jump_label.c:829 static_key_disable_cpuslocked+0x154/0x1c0 kernel/jump_label.c:235 static_key_disable+0x1a/0x20 kernel/jump_label.c:243 toggle_allocation_gate mm/kfence/core.c:835 [inline] toggle_allocation_gate+0x13f/0x250 mm/kfence/core.c:822 process_one_work+0x886/0x15d0 kernel/workqueue.c:2627 process_scheduled_works kernel/workqueue.c:2700 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2781 kthread+0x2c6/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 </TASK> --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
