INFO: task syz-executor.4:12922 blocked for more than 143 seconds. Not tainted 6.1.0-rc4-syzkaller-00294-geb037f16f7e8 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:23304 pid:12922 ppid:3656 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5191 [inline] __schedule+0x8c9/0xd70 kernel/sched/core.c:6503 schedule+0xcb/0x190 kernel/sched/core.c:6579 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_access fs/fuse/dir.c:1292 [inline] fuse_permission+0x85b/0xe30 fs/fuse/dir.c:1371 do_inode_permission fs/namei.c:458 [inline] inode_permission+0x22c/0x450 fs/namei.c:525 path_permission include/linux/fs.h:2916 [inline] __do_sys_chdir fs/open.c:518 [inline] __se_sys_chdir+0x146/0x220 fs/open.c:508 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: 0033:0x7ff8e708b639 RSP: 002b:00007ff8e7e1f168 EFLAGS: 00000246 ORIG_RAX: 0000000000000050 RAX: ffffffffffffffda RBX: 00007ff8e71abf80 RCX: 00007ff8e708b639 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020004340 RBP: 00007ff8e70e6a41 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe3c70293f R14: 00007ff8e7e1f300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8cb226f0 (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: ffffffff8cb22ef0 (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: ffffffff8cb22520 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 2 locks held by khugepaged/34: 2 locks held by kworker/u4:5/1180: 1 lock held by udevd/2975: 2 locks held by getty/3289: #0: ffff88814ac5a098 (&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-fuzzer/3605: #0: ffff8880180e2598 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_read_lock+0x17/0x50 include/linux/mmap_lock.h:117 1 lock held by syz-fuzzer/3639: #0: ffff8880180e2598 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_read_lock+0x17/0x50 include/linux/mmap_lock.h:117 1 lock held by syz-executor.2/3644: 1 lock held by syz-executor.3/3652: #0: ffffffff8cb27af8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:324 [inline] #0: ffffffff8cb27af8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x455/0x860 kernel/rcu/tree_exp.h:946 2 locks held by kworker/1:14/4552: #0: ffff888012066538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x7f2/0xdb0 #1: ffffc9000bf2fd00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264 2 locks held by kworker/u4:14/8235: 2 locks held by kworker/u4:15/8236: #0: ffff8880b9b39dd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x25/0x110 kernel/sched/core.c:537 #1: ffff8880b9a27788 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x611/0x9a0 kernel/sched/psi.c:909 2 locks held by syz-executor.4/13069: #0: ffff88808fa26460 (sb_writers#18){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:393 #1: ffff88806faea310 (&type->i_mutex_dir_key#12/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:791 [inline] #1: ffff88806faea310 (&type->i_mutex_dir_key#12/1){+.+.}-{3:3}, at: filename_create+0x22a/0x4f0 fs/namei.c:3806 1 lock held by udevd/13088: #0: ffff888140d708c0 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:811 [inline] #0: ffff888140d708c0 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0xe9/0x820 mm/readahead.c:226 3 locks held by udevd/13093: 1 lock held by udevd/13526: #0: ffff88801bfe60c0 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:811 [inline] #0: ffff88801bfe60c0 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0xe9/0x820 mm/readahead.c:226 2 locks held by udevd/13527: #0: ffff88807e5ec460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:393 #1: ffff8880b9b39dd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x25/0x110 kernel/sched/core.c:537 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.1.0-rc4-syzkaller-00294-geb037f16f7e8 #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: 13089 Comm: udevd Not tainted 6.1.0-rc4-syzkaller-00294-geb037f16f7e8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:unwind_next_frame+0x1afc/0x24c0 arch/x86/kernel/unwind_orc.c:629 Code: 00 80 3b 00 0f 85 d3 f5 ff ff 80 3d 93 42 be 0c 00 0f 85 c6 f5 ff ff c6 05 86 42 be 0c 01 48 c7 c7 a0 91 8a 8a e9 99 f5 ff ff 01 00 00 00 e8 fa 77 20 00 65 8b 0d 8b 6c c7 7e b0 01 85 c9 0f RSP: 0018:ffffc90005c87760 EFLAGS: 00000206 RAX: ffffc90005c87c70 RBX: 1ffff92000b90f08 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: ffffc90005c80000 RDI: ffffc90005c87850 RBP: ffffc90005c87840 R08: ffffc90005c87c58 R09: dffffc0000000000 R10: fffff52000b90f14 R11: 1ffff92000b90f12 R12: ffffc90005c87c68 R13: ffffffff8e9af852 R14: ffffc90005c80000 R15: ffffc90005c88000 FS: 00007fc2f7ba5840(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c0289bd000 CR3: 0000000027e15000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: arch_stack_walk+0xb2/0xe0 arch/x86/kernel/stacktrace.c:25 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_slab_alloc+0x65/0x70 mm/kasan/common.c:325 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:737 [inline] slab_alloc_node mm/slub.c:3398 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc+0x1cc/0x300 mm/slub.c:3422 getname_flags+0xb8/0x4e0 fs/namei.c:139 vfs_fstatat fs/stat.c:266 [inline] __do_sys_newfstatat fs/stat.c:437 [inline] __se_sys_newfstatat+0xcb/0x7d0 fs/stat.c:431 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: 0033:0x7fc2f77251da Code: 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 0b 00 00 00 66 2e 0f 1f 84 00 00 00 00 00 90 41 89 ca b8 06 01 00 00 0f 05 <3d> 00 f0 ff ff 77 07 31 c0 c3 0f 1f 40 00 48 8b 15 69 fc 0c 00 f7 RSP: 002b:00007fff8f0beec8 EFLAGS: 00000202 ORIG_RAX: 0000000000000106 RAX: ffffffffffffffda RBX: 00007fff8f0bef78 RCX: 00007fc2f77251da RDX: 00007fff8f0beee8 RSI: 00007fff8f0bf898 RDI: 00000000ffffff9c RBP: 00007fff8f0bf898 R08: 0000000000000000 R09: 00007fff8f0bf680 R10: 0000000000000100 R11: 0000000000000202 R12: 0000000000000005 R13: 000055cd660569f0 R14: 000055cd660531a0 R15: 00007fff8f0bf8a6