INFO: task syz-executor.2:12715 blocked for more than 143 seconds. Not tainted 6.1.0-rc6-syzkaller-00015-gc3eb11fbb826 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:22456 pid:12715 ppid:3697 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5209 [inline] __schedule+0x8c9/0xd70 kernel/sched/core.c:6521 schedule+0xcb/0x190 kernel/sched/core.c:6597 rwsem_down_write_slowpath+0xfc1/0x1480 kernel/locking/rwsem.c:1190 __down_write_common kernel/locking/rwsem.c:1305 [inline] __down_write kernel/locking/rwsem.c:1314 [inline] down_write+0x231/0x270 kernel/locking/rwsem.c:1563 inode_lock include/linux/fs.h:756 [inline] chown_common+0x414/0x8f0 fs/open.c:729 do_fchownat+0x165/0x240 fs/open.c:767 __do_sys_chown fs/open.c:787 [inline] __se_sys_chown fs/open.c:785 [inline] __x64_sys_chown+0x7e/0x90 fs/open.c:785 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f0fc2e8c0d9 RSP: 002b:00007f0fc3b40168 EFLAGS: 00000246 ORIG_RAX: 000000000000005c RAX: ffffffffffffffda RBX: 00007f0fc2fabf80 RCX: 00007f0fc2e8c0d9 RDX: 000000000000000a RSI: ffffffffffffffff RDI: 0000000020000140 RBP: 00007f0fc2ee7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe4a6aa67f R14: 00007f0fc3b40300 R15: 0000000000022000 INFO: task syz-executor.2:12745 blocked for more than 143 seconds. Not tainted 6.1.0-rc6-syzkaller-00015-gc3eb11fbb826 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:22024 pid:12745 ppid:3697 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5209 [inline] __schedule+0x8c9/0xd70 kernel/sched/core.c:6521 schedule+0xcb/0x190 kernel/sched/core.c:6597 request_wait_answer fs/fuse/dev.c:407 [inline] __fuse_request_send fs/fuse/dev.c:426 [inline] fuse_simple_request+0x1034/0x1870 fs/fuse/dev.c:511 fuse_do_setattr+0x10e3/0x1e90 fs/fuse/dir.c:1767 fuse_setattr+0x4e4/0xae0 fs/fuse/dir.c:1880 notify_change+0xe38/0x10f0 fs/attr.c:420 chown_common+0x586/0x8f0 fs/open.c:736 do_fchownat+0x165/0x240 fs/open.c:767 __do_sys_chown fs/open.c:787 [inline] __se_sys_chown fs/open.c:785 [inline] __x64_sys_chown+0x7e/0x90 fs/open.c:785 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f0fc2e8c0d9 RSP: 002b:00007f0fc3b1f168 EFLAGS: 00000246 ORIG_RAX: 000000000000005c RAX: ffffffffffffffda RBX: 00007f0fc2fac050 RCX: 00007f0fc2e8c0d9 RDX: 000000000000000a RSI: ffffffffffffffff RDI: 0000000020000140 RBP: 00007f0fc2ee7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe4a6aa67f R14: 00007f0fc3b1f300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8d127330 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 kernel/rcu/tasks.h:507 1 lock held by rcu_tasks_trace/13: #0: ffffffff8d127b30 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 kernel/rcu/tasks.h:507 1 lock held by khungtaskd/28: #0: ffffffff8d127160 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 2 locks held by kworker/u4:2/41: 2 locks held by kworker/0:2/153: #0: ffff888012864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7f2/0xdb0 #1: ffffc90002d3fd00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264 1 lock held by udevd/2997: 2 locks held by getty/3310: #0: ffff88814aabf098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244 #1: ffffc900031262f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x53b/0x1650 drivers/tty/n_tty.c:2177 1 lock held by syz-executor.5/3679: #0: ffffffff8d12c738 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:324 [inline] #0: ffffffff8d12c738 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x455/0x860 kernel/rcu/tree_exp.h:946 2 locks held by kworker/0:4/3739: #0: ffff888012864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7f2/0xdb0 #1: ffffc90005a4fd00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264 2 locks held by kworker/0:5/3742: #0: ffff888012864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7f2/0xdb0 #1: ffffc90005a8fd00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264 2 locks held by kworker/0:6/3743: #0: ffff888012864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7f2/0xdb0 #1: ffffc90005a9fd00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264 2 locks held by kworker/u4:3/3758: 2 locks held by kworker/0:8/3818: #0: ffff888012864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7f2/0xdb0 #1: ffffc90005bffd00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264 2 locks held by kworker/0:9/4153: #0: ffff888012864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7f2/0xdb0 #1: ffffc900097efd00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264 2 locks held by kworker/0:10/4154: #0: ffff888012864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7f2/0xdb0 #1: ffffc9000a13fd00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264 2 locks held by kworker/0:13/4158: #0: ffff888012864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7f2/0xdb0 #1: ffffc90009cc7d00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264 2 locks held by kworker/0:16/4303: #0: ffff888012864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7f2/0xdb0 #1: ffffc9000b8f7d00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264 3 locks held by kworker/1:12/4415: #0: ffff888012864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7f2/0xdb0 #1: ffffc9000c74fd00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264 #2: ffffffff8d12c738 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:292 [inline] #2: ffffffff8d12c738 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x384/0x860 kernel/rcu/tree_exp.h:946 2 locks held by kworker/0:18/6007: #0: ffff888012864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7f2/0xdb0 #1: ffffc9000c5a7d00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264 2 locks held by kworker/u4:10/10948: 2 locks held by syz-executor.2/12715: #0: ffff888030fe4460 (sb_writers#31){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:393 #1: ffff888033688810 (&type->i_mutex_dir_key#19){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff888033688810 (&type->i_mutex_dir_key#19){+.+.}-{3:3}, at: chown_common+0x414/0x8f0 fs/open.c:729 2 locks held by syz-executor.2/12745: #0: ffff888030fe4460 (sb_writers #31){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:393 #1: ffff888033688810 (&type->i_mutex_dir_key#19){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff888033688810 (&type->i_mutex_dir_key#19){+.+.}-{3:3}, at: chown_common+0x414/0x8f0 fs/open.c:729 2 locks held by kworker/0:20/13674: #0: ffff888012864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7f2/0xdb0 #1: ffffc9000354fd00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264 2 locks held by kworker/0:21/13675: #0: ffff888012864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7f2/0xdb0 #1: ffffc90018287d00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264 2 locks held by kworker/1:21/14484: #0: ffff888012866538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x7f2/0xdb0 #1: ffffc9000cb4fd00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264 2 locks held by kworker/0:22/14851: #0: ffff888012864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7f2/0xdb0 #1: ffffc90017c17d00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264 2 locks held by kworker/0:23/14852: #0: ffff888012864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7f2/0xdb0 #1: ffffc90017bf7d00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264 2 locks held by kworker/0:25/14854: #0: ffff888012864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7f2/0xdb0 #1: ffffc90017c07d00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264 2 locks held by kworker/0:26/14855: #0: ffff888012864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7f2/0xdb0 #1: ffffc90017c27d00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264 2 locks held by kworker/0:27/14856: #0: ffff888012864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7f2/0xdb0 #1: ffffc90016cc7d00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264 2 locks held by kworker/0:28/14857: #0: ffff888012864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7f2/0xdb0 #1: ffffc90017c37d00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264 2 locks held by kworker/0:29/15496: #0: ffff888012864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7f2/0xdb0 #1: ffffc90003b8fd00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264 2 locks held by kworker/0:30/15497: #0: ffff888012864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7f2/0xdb0 #1: ffffc90003b7fd00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264 2 locks held by kworker/0:33/16003: #0: ffff888012864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7f2/0xdb0 #1: ffffc9000b42fd00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.1.0-rc6-syzkaller-00015-gc3eb11fbb826 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106 nmi_cpu_backtrace+0x46f/0x4f0 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1ba/0x420 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline] watchdog+0xcf5/0xd40 kernel/hung_task.c:377 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 14855 Comm: kworker/0:26 Not tainted 6.1.0-rc6-syzkaller-00015-gc3eb11fbb826 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: events nsim_dev_trap_report_work RIP: 0010:preempt_count_sub+0x2d/0x160 kernel/sched/core.c:5697 Code: 89 fb 48 c7 c0 40 f0 d8 91 48 c1 e8 03 49 be 00 00 00 00 00 fc ff df 42 8a 04 30 84 c0 0f 85 c2 00 00 00 83 3d 33 bd 7a 10 00 <75> 22 65 8b 05 32 3c a4 7e 89 c1 81 e1 ff ff ff 7f 39 d9 7c 23 81 RSP: 0018:ffffc90017c274c0 EFLAGS: 00000246 RAX: 1ffffffff23b1e04 RBX: 0000000000000001 RCX: ffffffff91d8f003 RDX: dffffc0000000000 RSI: ffffc90017c20000 RDI: 0000000000000001 RBP: ffffc90017c27620 R08: ffffc90017c27610 R09: dffffc0000000000 R10: fffff52002f84ed0 R11: 1ffff92002f84ece R12: ffffc90017c27620 R13: ffffffff8efb4ab8 R14: dffffc0000000000 R15: ffffc90017c28000 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555555a8c708 CR3: 000000000ce8e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: unwind_next_frame+0x1b06/0x24c0 arch/x86/kernel/unwind_orc.c:629 __unwind_start+0x5b7/0x760 arch/x86/kernel/unwind_orc.c:717 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0x76/0xe0 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x104/0x1e0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x3d/0x60 mm/kasan/common.c:52 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:511 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0x71/0x110 mm/slub.c:3674 skb_free_head net/core/skbuff.c:760 [inline] skb_release_data+0x536/0x6d0 net/core/skbuff.c:789 skb_release_all net/core/skbuff.c:854 [inline] __kfree_skb+0x56/0x1d0 net/core/skbuff.c:868 nsim_dev_trap_report drivers/net/netdevsim/dev.c:824 [inline] nsim_dev_trap_report_work+0x767/0xaa0 drivers/net/netdevsim/dev.c:853 process_one_work+0x877/0xdb0 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306