INFO: task syz.4.3466:29876 blocked for more than 143 seconds. Not tainted 6.12.0-syzkaller-09734-g445d9f05fa14 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.3466 state:D stack:27280 pid:29876 tgid:29872 ppid:10441 flags:0x00000006 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0xe58/0x5ad0 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6848 schedule_timeout+0x244/0x280 kernel/time/sleep_timeout.c:75 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common+0x3e1/0x600 kernel/sched/completion.c:116 wait_for_common kernel/sched/completion.c:127 [inline] wait_for_completion_state+0x1c/0x40 kernel/sched/completion.c:264 coredump_wait fs/coredump.c:418 [inline] do_coredump+0x82f/0x43e0 fs/coredump.c:575 get_signal+0x23f3/0x2610 kernel/signal.c:3001 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f43d9840430 RSP: 002b:00007f43d77b3b38 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000000 RBX: 00007f43d9b46168 RCX: 00007f43d9980809 RDX: 00007f43d77b3b40 RSI: 00007f43d77b3c70 RDI: 000000000000000b RBP: 00007f43d9b46160 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f43d9b4616c R13: 0000000000000000 R14: 00007ffd91da75d0 R15: 00007ffd91da76b8 INFO: task syz.4.3466:29877 blocked for more than 143 seconds. Not tainted 6.12.0-syzkaller-09734-g445d9f05fa14 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.3466 state:D stack:28576 pid:29877 tgid:29872 ppid:10441 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0xe58/0x5ad0 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6848 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905 __mutex_lock_common kernel/locking/mutex.c:665 [inline] __mutex_lock+0x62b/0xa60 kernel/locking/mutex.c:735 nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 nfsd_umount+0x48/0xe0 fs/nfsd/nfsctl.c:1428 deactivate_locked_super+0xbe/0x1a0 fs/super.c:473 deactivate_super+0xde/0x100 fs/super.c:506 cleanup_mnt+0x222/0x450 fs/namespace.c:1373 task_work_run+0x14e/0x250 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f43d9980809 RSP: 002b:00007f43d7793058 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffea RBX: 00007f43d9b46240 RCX: 00007f43d9980809 RDX: 0000000020000140 RSI: 0000000020000100 RDI: 0000000000000000 RBP: 00007f43d99f393e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000001000c87 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f43d9b46240 R15: 00007ffd91da76b8 Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8dfbaf40 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8dfbaf40 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8dfbaf40 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6744 2 locks held by getty/5601: #0: ffff88814d7190a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc90002fde2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211 3 locks held by kworker/u8:30/7254: 3 locks held by kworker/u8:10/26112: #0: ffff888030c10948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x126b/0x1b30 kernel/workqueue.c:3204 #1: ffffc90005897d80 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x8bb/0x1b30 kernel/workqueue.c:3205 #2: ffffffff8fcd4508 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0xcf/0x14d0 net/ipv6/addrconf.c:4196 3 locks held by kworker/1:5/27816: #0: ffff88801ac80948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x126b/0x1b30 kernel/workqueue.c:3204 #1: ffffc9000bdafd80 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work+0x8bb/0x1b30 kernel/workqueue.c:3205 #2: ffff8880a08b0240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x1ce/0x3190 drivers/net/netdevsim/fib.c:1490 2 locks held by syz.8.3459/29847: #0: ffffffff8fd73250 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218 #1: ffffffff8e3bbc48 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_threads_set_doit+0x694/0xbe0 fs/nfsd/nfsctl.c:1671 2 locks held by syz.4.3466/29877: #0: ffff88802821c0e0 (&type->s_umount_key#48){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88802821c0e0 (&type->s_umount_key#48){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88802821c0e0 (&type->s_umount_key#48){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e3bbc48 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 2 locks held by syz.2.3491/29977: #0: ffff888020fa00e0 (&type->s_umount_key#48){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff888020fa00e0 (&type->s_umount_key#48){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff888020fa00e0 (&type->s_umount_key#48){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e3bbc48 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 2 locks held by syz.6.3502/30014: #0: ffff88805b8520e0 (&type->s_umount_key#48){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88805b8520e0 (&type->s_umount_key#48){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88805b8520e0 (&type->s_umount_key#48){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e3bbc48 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 2 locks held by syz-executor/30021: #0: ffff88807edae0e0 (&type->s_umount_key#48){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88807edae0e0 (&type->s_umount_key#48){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88807edae0e0 (&type->s_umount_key#48){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e3bbc48 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 2 locks held by syz-executor/30040: #0: ffff8880915960e0 (&type->s_umount_key#48){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff8880915960e0 (&type->s_umount_key#48){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff8880915960e0 (&type->s_umount_key#48){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e3bbc48 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 2 locks held by syz-executor/30252: #0: ffff88806d2a40e0 (&type->s_umount_key#48){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88806d2a40e0 (&type->s_umount_key#48){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88806d2a40e0 (&type->s_umount_key#48){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e3bbc48 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 2 locks held by syz.0.3569/30662: #0: ffffffff8fd73250 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218 #1: ffffffff8e3bbc48 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_threads_set_doit+0x694/0xbe0 fs/nfsd/nfsctl.c:1671 2 locks held by syz-executor/31184: #0: ffff88804650c0e0 (&type->s_umount_key#48){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88804650c0e0 (&type->s_umount_key#48){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88804650c0e0 (&type->s_umount_key#48){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e3bbc48 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 2 locks held by syz.5.3623/31522: #0: ffffffff8fd73250 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218 #1: ffffffff8e3bbc48 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_listener_set_doit+0xe3/0x1b40 fs/nfsd/nfsctl.c:1964 2 locks held by syz-executor/31901: #0: ffff88807d3960e0 (&type->s_umount_key#48){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88807d3960e0 (&type->s_umount_key#48){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88807d3960e0 (&type->s_umount_key#48){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e3bbc48 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 3 locks held by syz-executor/894: #0: ffffffff8fcd4508 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fcd4508 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:326 [inline] #0: ffffffff8fcd4508 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x5c8/0x1c10 net/core/rtnetlink.c:4000 #1: ffff8880afb214e8 (&wg->device_update_lock){+.+.}-{4:4}, at: wg_open+0x203/0x4e0 drivers/net/wireguard/device.c:50 #2: ffffffff8dfc6878 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x282/0x3b0 kernel/rcu/tree_exp.h:297 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-syzkaller-09734-g445d9f05fa14 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x29c/0x300 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+0xf14/0x1240 kernel/hung_task.c:397 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 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: 5835 Comm: syz-executor Not tainted 6.12.0-syzkaller-09734-g445d9f05fa14 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:write_comp_data+0x8b/0x90 kernel/kcov.c:272 Code: 00 00 4a 8d 34 dd 28 00 00 00 48 39 f2 72 1b 48 83 c7 01 48 89 38 4c 89 44 30 e0 4c 89 4c 30 e8 4c 89 54 30 f0 4a 89 4c d8 20 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 RSP: 0018:ffffc90003edfa50 EFLAGS: 00000012 RAX: 0000000040000000 RBX: ffff88802e695a00 RCX: ffffffff8130030b RDX: ffff88802e695a00 RSI: 0000000000000000 RDI: 0000000000000007 RBP: ffff8880328c1e00 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 000055557aab7500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe182a2d68 CR3: 000000003200c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: switch_to_extra arch/x86/kernel/process.h:36 [inline] __switch_to+0x70b/0x1190 arch/x86/kernel/process_64.c:679 context_switch kernel/sched/core.c:5369 [inline] __schedule+0xe58/0x5ad0 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6848 do_nanosleep+0x216/0x510 kernel/time/hrtimer.c:2079 hrtimer_nanosleep+0x158/0x380 kernel/time/hrtimer.c:2126 common_nsleep+0xa1/0xd0 kernel/time/posix-timers.c:1356 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1402 [inline] __se_sys_clock_nanosleep kernel/time/posix-timers.c:1379 [inline] __x64_sys_clock_nanosleep+0x344/0x4a0 kernel/time/posix-timers.c:1379 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2c90fb28a3 Code: 1f 84 00 00 00 00 00 83 ff 03 74 7b 83 ff 02 b8 fa ff ff ff 49 89 ca 0f 44 f8 80 3d 9e ec 15 00 00 74 14 b8 e6 00 00 00 0f 05 d8 c3 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec 28 48 89 54 24 10 RSP: 002b:00007ffdcdf54908 EFLAGS: 00000202 ORIG_RAX: 00000000000000e6 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2c90fb28a3 RDX: 00007ffdcdf54920 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 000000000002d8aa R09: 00007f2c91da8000 R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffdcdf54d60 R13: 0000000000000004 R14: 00007ffdcdf5495c R15: 00007ffdcdf549e0