INFO: task syz.3.45:5577 blocked for more than 143 seconds. Not tainted 6.11.0-syzkaller-10622-gaa486552a110 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.45 state:D stack:25024 pid:5577 tgid:5573 ppid:5224 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5315 [inline] __schedule+0x1843/0x4ae0 kernel/sched/core.c:6675 __schedule_loop kernel/sched/core.c:6752 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6767 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6824 rwsem_down_write_slowpath+0xeee/0x13b0 kernel/locking/rwsem.c:1178 __down_write_common kernel/locking/rwsem.c:1306 [inline] __down_write kernel/locking/rwsem.c:1315 [inline] down_write_nested+0x1e0/0x220 kernel/locking/rwsem.c:1696 inode_lock_nested include/linux/fs.h:850 [inline] do_unlinkat+0x26a/0x830 fs/namei.c:4520 __do_sys_unlink fs/namei.c:4581 [inline] __se_sys_unlink fs/namei.c:4579 [inline] __x64_sys_unlink+0x47/0x50 fs/namei.c:4579 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7c4697df39 RSP: 002b:00007f7c47770038 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 00007f7c46b36058 RCX: 00007f7c4697df39 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200000c0 RBP: 00007f7c469f0216 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f7c46b36058 R15: 00007ffd05190428 Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6701 5 locks held by kworker/u8:8/2556: 2 locks held by getty/4973: #0: ffff88814bfc70a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 2 locks held by syz-executor/5214: #0: ffff88807c9960e0 (&type->s_umount_key#110){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff88807c9960e0 (&type->s_umount_key#110){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88807c9960e0 (&type->s_umount_key#110){++++}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:505 #1: ffff888047780278 (&c->state_lock){+.+.}-{3:3}, at: __bch2_fs_stop+0xfd/0x540 fs/bcachefs/super.c:618 2 locks held by kworker/u8:14/5415: #0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc90008b47d00 ((reaper_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc90008b47d00 ((reaper_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 2 locks held by syz.3.45/5574: 2 locks held by syz.3.45/5577: #0: ffff888031e70420 (sb_writers#25){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:515 #1: ffff888061114180 (&type->i_mutex_dir_key#18/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:850 [inline] #1: ffff888061114180 (&type->i_mutex_dir_key#18/1){+.+.}-{3:3}, at: do_unlinkat+0x26a/0x830 fs/namei.c:4520 2 locks held by bch-reclaim/loo/6018: 2 locks held by udevd/6401: 1 lock held by syz.0.271/6586: #0: ffff88807c9960e0 (&type->s_umount_key#110){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807c9960e0 (&type->s_umount_key#110){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 2 locks held by syz.0.331/6846: 2 locks held by syz.3.332/6848: 2 locks held by syz.1.327/6852: ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-syzkaller-10622-gaa486552a110 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xff4/0x1040 kernel/hung_task.c:379 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 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 UID: 0 PID: 6401 Comm: udevd Not tainted 6.11.0-syzkaller-10622-gaa486552a110 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:unwind_next_frame+0x5/0x22d0 arch/x86/kernel/unwind_orc.c:469 Code: 80 e1 07 80 c1 03 38 c1 7c 91 4c 89 f7 e8 83 18 ba 00 eb 87 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 <41> 57 41 56 41 55 41 54 53 48 81 ec 98 00 00 00 49 89 fd 49 bc 00 RSP: 0018:ffffc90017d271f0 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffffc90017d27200 RCX: ffffffff91798000 RDX: dffffc0000000000 RSI: ffffffff8211bc6a RDI: ffffc90017d27200 RBP: ffffc90017d27290 R08: 000000000000000c R09: ffffc90017d272f0 R10: ffffc90017d27250 R11: ffffffff81806820 R12: ffff88802ae1da00 R13: ffffffff81806820 R14: ffffc90017d272e0 R15: 0000000000000000 FS: 00007f08aeecbc80(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9eb4fd1000 CR3: 0000000063bac000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 save_stack+0xfb/0x1f0 mm/page_owner.c:156 __reset_page_owner+0x76/0x430 mm/page_owner.c:297 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1108 [inline] free_unref_page+0xcd0/0xf00 mm/page_alloc.c:2638 discard_slab mm/slub.c:2678 [inline] __put_partials+0xeb/0x130 mm/slub.c:3146 put_cpu_partial+0x17c/0x250 mm/slub.c:3221 __slab_free+0x2ea/0x3d0 mm/slub.c:4450 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:247 [inline] slab_post_alloc_hook mm/slub.c:4086 [inline] slab_alloc_node mm/slub.c:4135 [inline] __do_kmalloc_node mm/slub.c:4264 [inline] __kmalloc_noprof+0x1a6/0x400 mm/slub.c:4277 kmalloc_noprof include/linux/slab.h:882 [inline] tomoyo_realpath_from_path+0xcf/0x5e0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path2_perm+0x3eb/0xbb0 security/tomoyo/file.c:923 tomoyo_path_rename+0x198/0x1e0 security/tomoyo/tomoyo.c:300 security_path_rename+0x266/0x4e0 security/security.c:2020 do_renameat2+0x94a/0x13f0 fs/namei.c:5157 __do_sys_rename fs/namei.c:5217 [inline] __se_sys_rename fs/namei.c:5215 [inline] __x64_sys_rename+0x82/0x90 fs/namei.c:5215 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f08aef2593b Code: 48 8b 15 f0 64 15 00 83 c8 ff 64 83 3a 15 75 0e 48 8b 7c 24 08 e8 d5 d4 07 00 f7 d8 19 c0 48 83 c4 18 c3 b8 52 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 10 48 8b 15 be 64 15 00 f7 d8 64 89 02 48 83 RSP: 002b:00007ffe548aba58 EFLAGS: 00000206 ORIG_RAX: 0000000000000052 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f08aef2593b RDX: 00005632b053929d RSI: 00007ffe548aba78 RDI: 00007ffe548abe78 RBP: 00005637d32e9580 R08: 0000000000000006 R09: b3255b22a8c0b8db R10: 000000000000010f R11: 0000000000000206 R12: 00005637d32edca0 R13: 00007ffe548aba78 R14: 00007ffe548abe78 R15: 00005637b6433ec8