INFO: task kworker/1:0:23 blocked for more than 143 seconds. Not tainted 6.9.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:0 state:D stack:13944 pid:23 tgid:23 ppid:2 flags:0x00004000 Workqueue: events p9_write_work Call Trace: context_switch kernel/sched/core.c:5409 [inline] __schedule+0x615/0x9a0 kernel/sched/core.c:6746 __schedule_loop kernel/sched/core.c:6823 [inline] schedule+0xac/0x140 kernel/sched/core.c:6838 schedule_preempt_disabled+0x32/0x60 kernel/sched/core.c:6895 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x44a/0x970 kernel/locking/mutex.c:752 pipe_write+0x4e/0x6d0 fs/pipe.c:455 __kernel_write_iter+0x136/0x210 fs/read_write.c:523 __kernel_write fs/read_write.c:543 [inline] kernel_write+0x18d/0x2b0 fs/read_write.c:564 p9_fd_write net/9p/trans_fd.c:432 [inline] p9_write_work+0x15e/0x310 net/9p/trans_fd.c:483 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0x2ca/0x610 kernel/workqueue.c:3335 worker_thread+0x23e/0x300 kernel/workqueue.c:3416 kthread+0xea/0x100 kernel/kthread.c:388 ret_from_fork+0x32/0x40 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Showing all locks held in the system: 3 locks held by kworker/0:1/9: #0: ffff888100078548 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3229 [inline] #0: ffff888100078548 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x265/0x610 kernel/workqueue.c:3335 #1: ffffc90000053e58 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3230 [inline] #1: ffffc90000053e58 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x285/0x610 kernel/workqueue.c:3335 #2: ffff88810c399e68 (&pipe->mutex){....}-{3:3}, at: pipe_write+0x4e/0x6d0 fs/pipe.c:455 3 locks held by kworker/1:0/23: #0: ffff888100078548 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3229 [inline] #0: ffff888100078548 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x265/0x610 kernel/workqueue.c:3335 #1: ffffc900000cbe58 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3230 [inline] #1: ffffc900000cbe58 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x285/0x610 kernel/workqueue.c:3335 #2: ffff888101bdfa68 (&pipe->mutex){....}-{3:3}, at: pipe_write+0x4e/0x6d0 fs/pipe.c:455 1 lock held by khungtaskd/28: #0: ffffffff835d9690 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #0: ffffffff835d9690 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #0: ffffffff835d9690 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x30/0x100 kernel/locking/lockdep.c:6614 3 locks held by kworker/1:2/207: #0: ffff888100078548 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3229 [inline] #0: ffff888100078548 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x265/0x610 kernel/workqueue.c:3335 #1: ffffc90000e33e58 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3230 [inline] #1: ffffc90000e33e58 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x285/0x610 kernel/workqueue.c:3335 #2: ffff888105b31e68 (&pipe->mutex){....}-{3:3}, at: pipe_write+0x4e/0x6d0 fs/pipe.c:455 3 locks held by kworker/0:2/1457: #0: ffff888100078548 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3229 [inline] #0: ffff888100078548 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x265/0x610 kernel/workqueue.c:3335 #1: ffffc900034abe58 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3230 [inline] #1: ffffc900034abe58 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x285/0x610 kernel/workqueue.c:3335 #2: ffff888106be1068 (&pipe->mutex){....}-{3:3}, at: pipe_write+0x4e/0x6d0 fs/pipe.c:455 2 locks held by getty/1608: #0: ffff888102be48a0 (&tty->ldisc_sem){....}-{0:0}, at: tty_ldisc_ref_wait+0x20/0x40 drivers/tty/tty_ldisc.c:243 #1: ffffc900034af2f0 (&ldata->atomic_read_lock){....}-{3:3}, at: n_tty_read+0x1be/0x700 drivers/tty/n_tty.c:2201 2 locks held by syz.3.16/3503: #0: ffff888101bdfa68 (&pipe->mutex){....}-{3:3}, at: pipe_write+0x4e/0x6d0 fs/pipe.c:455 #1: ffff888112a702f0 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:850 [inline] #1: ffff888112a702f0 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x5e/0x240 mm/readahead.c:225 2 locks held by syz.4.17/3922: #0: ffff888105b31e68 (&pipe->mutex){....}-{3:3}, at: pipe_write+0x4e/0x6d0 fs/pipe.c:455 #1: ffff888112a482f0 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:850 [inline] #1: ffff888112a482f0 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x5e/0x240 mm/readahead.c:225 3 locks held by kworker/1:3/3924: #0: ffff888100078548 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3229 [inline] #0: ffff888100078548 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x265/0x610 kernel/workqueue.c:3335 #1: ffffc900028a3e58 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3230 [inline] #1: ffffc900028a3e58 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x285/0x610 kernel/workqueue.c:3335 #2: ffff88810c73e668 (&pipe->mutex){....}-{3:3}, at: pipe_write+0x4e/0x6d0 fs/pipe.c:455 2 locks held by syz.5.18/4343: #0: ffff88810c399e68 (&pipe->mutex){....}-{3:3}, at: pipe_write+0x4e/0x6d0 fs/pipe.c:455 #1: ffff888112a48848 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:850 [inline] #1: ffff888112a48848 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x5e/0x240 mm/readahead.c:225 2 locks held by syz.6.19/4763: #0: ffff888106be1068 (&pipe->mutex){....}-{3:3}, at: pipe_write+0x4e/0x6d0 fs/pipe.c:455 #1: ffff888112a70848 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:850 [inline] #1: ffff888112a70848 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x5e/0x240 mm/readahead.c:225 3 locks held by kworker/0:3/4764: #0: ffff888100078548 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3229 [inline] #0: ffff888100078548 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x265/0x610 kernel/workqueue.c:3335 #1: ffffc900033f3e58 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3230 [inline] #1: ffffc900033f3e58 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x285/0x610 kernel/workqueue.c:3335 #2: ffff888111698068 (&pipe->mutex){....}-{3:3}, at: pipe_write+0x4e/0x6d0 fs/pipe.c:455 3 locks held by kworker/0:4/4765: #0: ffff888100078548 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3229 [inline] #0: ffff888100078548 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x265/0x610 kernel/workqueue.c:3335 #1: ffffc900034c7e58 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3230 [inline] #1: ffffc900034c7e58 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x285/0x610 kernel/workqueue.c:3335 #2: ffff888111699068 (&pipe->mutex){....}-{3:3}, at: pipe_write+0x4e/0x6d0 fs/pipe.c:455 2 locks held by syz.7.20/5184: #0: ffff88810c73e668 (&pipe->mutex){....}-{3:3}, at: pipe_write+0x4e/0x6d0 fs/pipe.c:455 #1: ffff888112a48da0 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:850 [inline] #1: ffff888112a48da0 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x5e/0x240 mm/readahead.c:225 3 locks held by kworker/1:4/5186: #0: ffff888100078548 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3229 [inline] #0: ffff888100078548 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x265/0x610 kernel/workqueue.c:3335 #1: ffffc90003ac7e58 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3230 [inline] #1: ffffc90003ac7e58 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x285/0x610 kernel/workqueue.c:3335 #2: ffff88810d79ac68 (&pipe->mutex){....}-{3:3}, at: pipe_write+0x4e/0x6d0 fs/pipe.c:455 2 locks held by syz.8.21/5605: #0: ffff88810d79ac68 (&pipe->mutex){....}-{3:3}, at: pipe_write+0x4e/0x6d0 fs/pipe.c:455 #1: ffff888112a492f8 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:850 [inline] #1: ffff888112a492f8 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x5e/0x240 mm/readahead.c:225 3 locks held by kworker/1:5/5607: #0: ffff888100078548 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3229 [inline] #0: ffff888100078548 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x265/0x610 kernel/workqueue.c:3335 #1: ffffc900041f7e58 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3230 [inline] #1: ffffc900041f7e58 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x285/0x610 kernel/workqueue.c:3335 #2: ffff88810ff00c68 (&pipe->mutex){....}-{3:3}, at: pipe_write+0x4e/0x6d0 fs/pipe.c:455 2 locks held by syz.9.22/6026: #0: ffff888111698068 (&pipe->mutex){....}-{3:3}, at: pipe_write+0x4e/0x6d0 fs/pipe.c:455 #1: ffff888112a70da0 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:850 [inline] #1: ffff888112a70da0 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x5e/0x240 mm/readahead.c:225 2 locks held by syz.0.23/6445: #0: ffff88810ff00c68 (&pipe->mutex){....}-{3:3}, at: pipe_write+0x4e/0x6d0 fs/pipe.c:455 #1: ffff888112a712f8 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:850 [inline] #1: ffff888112a712f8 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x5e/0x240 mm/readahead.c:225 3 locks held by kworker/1:6/6447: #0: ffff888100078548 ((wq_completion)events){....}-{0:0}, at: process_one_work kernel/workqueue.c:3229 [inline] #0: ffff888100078548 ((wq_completion)events){....}-{0:0}, at: process_scheduled_works+0x265/0x610 kernel/workqueue.c:3335 #1: ffffc90004ea7e58 ((work_completion)(&m->wq)){....}-{0:0}, at: process_one_work kernel/workqueue.c:3230 [inline] #1: ffffc90004ea7e58 ((work_completion)(&m->wq)){....}-{0:0}, at: process_scheduled_works+0x285/0x610 kernel/workqueue.c:3335 #2: ffff88810ff0de68 (&pipe->mutex){....}-{3:3}, at: pipe_write+0x4e/0x6d0 fs/pipe.c:455 2 locks held by syz.1.24/6867: #0: ffff88810ff0de68 (&pipe->mutex){....}-{3:3}, at: pipe_write+0x4e/0x6d0 fs/pipe.c:455 #1: ffff888112a49850 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:850 [inline] #1: ffff888112a49850 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x5e/0x240 mm/readahead.c:225 2 locks held by syz.2.25/7287: #0: ffff888111699068 (&pipe->mutex){....}-{3:3}, at: pipe_write+0x4e/0x6d0 fs/pipe.c:455 #1: ffff888112a49da8 (mapping.invalidate_lock#3){....}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:850 [inline] #1: ffff888112a49da8 (mapping.invalidate_lock#3){....}-{3:3}, at: page_cache_ra_unbounded+0x5e/0x240 mm/readahead.c:225 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.9.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x3e/0xe0 lib/dump_stack.c:114 nmi_cpu_backtrace+0x146/0x160 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x8e/0x140 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0x5db/0x600 kernel/hung_task.c:380 kthread+0xea/0x100 kernel/kthread.c:388 ret_from_fork+0x32/0x40 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 36 Comm: kworker/u8:2 Not tainted 6.9.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:trace_tlb_flush include/trace/events/tlb.h:38 [inline] RIP: 0010:switch_mm_irqs_off+0x3f0/0x620 arch/x86/mm/tlb.c:642 Code: 1e fa 41 8d 4c 24 01 0f b7 c9 48 09 c8 f3 0f 1e fa 0f 22 d8 0f 1f 44 00 00 65 8b 05 46 eb fa 7e 89 c0 48 0f a3 05 58 b1 7e 02 <72> 55 eb 58 49 8b bd c0 00 00 00 48 8b 05 76 99 7e 02 e8 89 f8 ff RSP: 0018:ffffc90000137c48 EFLAGS: 00000007 RAX: 0000000000000000 RBX: ffff888100070000 RCX: 00000000034a8000 RDX: 0000000000000000 RSI: ffff888100070000 RDI: ffffffff834a8000 RBP: ffffffff834a8000 R08: 00000000000002bf R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff810416d0 R12: 0000000000000000 R13: ffffffff8360d700 R14: ffffffff8360d700 R15: 000000010006a000 FS: 0000000000000000(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f84a3615866 CR3: 00000000034a8000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: unuse_temporary_mm arch/x86/kernel/alternative.c:1832 [inline] __text_poke+0x2ed/0x440 arch/x86/kernel/alternative.c:1942 text_poke arch/x86/kernel/alternative.c:1985 [inline] text_poke_bp_batch+0x1e9/0x310 arch/x86/kernel/alternative.c:2318 text_poke_flush arch/x86/kernel/alternative.c:2487 [inline] text_poke_finish+0x1a/0x30 arch/x86/kernel/alternative.c:2494 arch_jump_label_transform_apply+0x17/0x30 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked kernel/jump_label.c:205 [inline] static_key_enable+0x40/0x60 kernel/jump_label.c:218 toggle_allocation_gate+0x3a/0x130 mm/kfence/core.c:826 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0x2ca/0x610 kernel/workqueue.c:3335 worker_thread+0x23e/0x300 kernel/workqueue.c:3416 kthread+0xea/0x100 kernel/kthread.c:388 ret_from_fork+0x32/0x40 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244