INFO: task syz.2.18:6767 blocked for more than 143 seconds. Not tainted 6.13.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.18 state:D stack:12504 pid:6767 tgid:6765 ppid:4704 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0x6ad/0xa70 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xac/0x140 kernel/sched/core.c:6848 schedule_preempt_disabled+0x32/0x60 kernel/sched/core.c:6905 __mutex_lock_common kernel/locking/mutex.c:665 [inline] __mutex_lock+0x451/0x980 kernel/locking/mutex.c:735 mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xb9/0x130 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x8d/0x190 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f05f798d169 RSP: 002b:00007f05f8726038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f05f7ba5fa0 RCX: 00007f05f798d169 RDX: 0000400000001f00 RSI: 0000000080044940 RDI: 0000000000000005 RBP: 00007f05f7a0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f05f7ba5fa0 R15: 00007ffc19c1bab8 Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff850017b8 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff850017b8 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff850017b8 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x30/0x100 kernel/locking/lockdep.c:6744 2 locks held by getty/2743: #0: ffff888106f888a0 (&tty->ldisc_sem){....}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x50 drivers/tty/tty_ldisc.c:243 #1: ffffc9000465f2f0 (&ldata->atomic_read_lock){....}-{3:3}, at: n_tty_read+0x26f/0xbb0 drivers/tty/n_tty.c:2211 3 locks held by syz.5.20/6555: 1 lock held by syz.2.18/6767: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.3.19/6820: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.0.16/6827: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.6.17/6854: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.7.21/8415: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.8.22/8918: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.4.24/9065: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.9.23/9081: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.1.25/9084: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.5.26/9437: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.2.27/10372: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.0.28/10747: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.3.30/10809: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.6.29/10824: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.7.31/11174: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.8.32/11558: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.9.33/12533: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.4.34/12617: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.1.35/12713: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.5.36/12920: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.2.37/13265: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.0.38/14263: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.3.39/14593: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.6.40/14665: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.7.41/14770: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.8.42/15005: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.9.43/15415: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.1.44/16498: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.4.45/16613: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.5.46/16669: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.2.47/16752: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 1 lock held by syz.0.48/17097: #0: ffffffff8527cc28 (mISDN_mutex){....}-{3:3}, at: mISDN_ioctl+0x5b/0x430 drivers/isdn/mISDN/timerdev.c:226 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x10e/0x1b0 lib/dump_stack.c:120 nmi_cpu_backtrace+0x234/0x250 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x102/0x220 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:234 [inline] watchdog+0x8e5/0x920 kernel/hung_task.c:397 kthread+0x114/0x140 kernel/kthread.c:389 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6555 Comm: syz.5.20 Not tainted 6.13.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:nilfs_page_mkwrite+0x63/0x5a0 fs/nilfs2/file.c:50 Code: 01 31 ff e8 bf 45 87 ff 48 89 d8 48 83 e0 01 0f 85 fe 03 00 00 0f 1f 44 00 00 e8 c8 40 87 ff 49 8b 85 80 00 00 00 4c 8b 60 68 <48> c7 44 24 20 00 00 00 00 48 c7 44 24 18 00 00 00 00 48 c7 44 24 RSP: 0018:ffffc90001a23b00 EFLAGS: 00000293 RAX: ffff88816730d080 RBX: ffffea0005e0b6c8 RCX: ffff8881053c9bc0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff81af8e11 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff81af8dd0 R12: ffff888172523058 R13: ffff888161b51280 R14: ffffea0005c784c0 R15: ffffc90001a23cc8 FS: 00007f8afcb666c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000400000001f00 CR3: 0000000164198000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: do_page_mkwrite+0x73/0x160 mm/memory.c:3176 wp_page_shared mm/memory.c:3577 [inline] do_wp_page+0x97c/0x25a0 mm/memory.c:3727 handle_pte_fault mm/memory.c:5817 [inline] __handle_mm_fault mm/memory.c:5944 [inline] handle_mm_fault+0x11a7/0x33c0 mm/memory.c:6112 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x299/0x6a0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:__put_user_4+0x11/0x20 arch/x86/lib/putuser.S:88 Code: 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 89 cb 48 c1 fb 3f 48 09 d9 0f 01 cb <89> 01 31 c9 0f 01 ca c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 RSP: 0018:ffffc90001a23e80 EFLAGS: 00050206 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000400000001f00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff82e9b1c8 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8881641ec1a8 R14: 0000400000001f00 R15: 0000000000000000 mISDN_ioctl+0x39d/0x430 drivers/isdn/mISDN/timerdev.c:241 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xb9/0x130 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x8d/0x190 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8afbd8d169 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8afcb66038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f8afbfa5fa0 RCX: 00007f8afbd8d169 RDX: 0000400000001f00 RSI: 0000000080044940 RDI: 0000000000000005 RBP: 00007f8afbe0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f8afbfa5fa0 R15: 00007ffc8142ce98