INFO: task syz-executor.3:10168 blocked for more than 143 seconds. Not tainted 5.12.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:27072 pid:10168 ppid: 8423 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5075 schedule+0xcf/0x270 kernel/sched/core.c:5154 rwsem_down_write_slowpath+0x7e5/0x1200 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write_common kernel/locking/rwsem.c:1258 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x137/0x150 kernel/locking/rwsem.c:1407 inode_lock include/linux/fs.h:775 [inline] lock_mount+0x8a/0x2e0 fs/namespace.c:2216 do_new_mount_fc fs/namespace.c:2846 [inline] do_new_mount fs/namespace.c:2905 [inline] path_mount+0x14d6/0x1f90 fs/namespace.c:3233 do_mount fs/namespace.c:3246 [inline] __do_sys_mount fs/namespace.c:3454 [inline] __se_sys_mount fs/namespace.c:3431 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3431 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465f69 RSP: 002b:00007f66ea8b3188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465f69 RDX: 0000000020002100 RSI: 00000000200042c0 RDI: 0000000000000000 RBP: 00000000004bfa67 R08: 0000000020002140 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffd306221df R14: 00007f66ea8b3300 R15: 0000000000022000 Showing all locks held in the system: 2 locks held by kworker/u4:3/103: #0: ffff8880b9c35258 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1321 [inline] #0: ffff8880b9c35258 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x217/0x21a0 kernel/sched/core.c:4992 #1: ffffc900011e7da8 ((work_completion)(&(&forw_packet_aggr->delayed_work)->work)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1600 kernel/workqueue.c:2250 1 lock held by khungtaskd/1655: #0: ffffffff8bf741a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6327 1 lock held by in:imklog/8098: #0: ffff888023390b70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:961 1 lock held by syz-executor.3/10168: #0: ffff8880820a1850 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #0: ffff8880820a1850 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lock_mount+0x8a/0x2e0 fs/namespace.c:2216 3 locks held by syz-executor.3/10173: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1655 Comm: khungtaskd Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xd48/0xfb0 kernel/hung_task.c:294 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 10173 Comm: syz-executor.3 Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:arch_atomic_fetch_add_unless include/linux/atomic-arch-fallback.h:1161 [inline] RIP: 0010:arch_atomic_add_unless include/linux/atomic-arch-fallback.h:1183 [inline] RIP: 0010:atomic_add_unless include/asm-generic/atomic-instrumented.h:789 [inline] RIP: 0010:_atomic_dec_and_lock+0x50/0x100 lib/dec_and_lock.c:24 Code: 00 00 fc ff df 48 c1 ea 03 0f b6 14 02 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 a0 00 00 00 44 8b 23 e8 60 4a 97 fd <44> 89 e6 bf 01 00 00 00 e8 a3 50 97 fd 41 83 fc 01 74 39 e8 48 4a RSP: 0018:ffffc900165e7180 EFLAGS: 00000246 RAX: 0000000000040000 RBX: ffff8880820a1908 RCX: ffffc9000fea9000 RDX: 0000000000040000 RSI: ffffffff83dc5780 RDI: ffff8880820a1908 RBP: ffff8880820a1788 R08: 0000000000000001 R09: ffff8880820a190b R10: ffffed1010414321 R11: 0000000000000000 R12: 0000000000000002 R13: ffff888081af4000 R14: ffff8880820a1788 R15: ffffc900165e7268 FS: 00007f66ea892700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2da45d8028 CR3: 00000000248e6000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: iput.part.0+0x67/0x810 fs/inode.c:1672 iput+0x58/0x70 fs/inode.c:1670 fuse_iget+0x24e/0x610 fs/fuse/inode.c:356 fuse_lookup_name+0x447/0x630 fs/fuse/dir.c:439 fuse_lookup.part.0+0xdf/0x390 fs/fuse/dir.c:469 fuse_lookup+0x70/0x90 fs/fuse/dir.c:465 __lookup_slow+0x24c/0x480 fs/namei.c:1626 lookup_slow fs/namei.c:1643 [inline] walk_component+0x418/0x6a0 fs/namei.c:1939 lookup_last fs/namei.c:2396 [inline] path_lookupat+0x1ba/0x830 fs/namei.c:2420 filename_lookup+0x19f/0x560 fs/namei.c:2453 tomoyo_mount_acl+0x291/0x840 security/tomoyo/mount.c:136 tomoyo_mount_permission+0x151/0x3f0 security/tomoyo/mount.c:237 security_sb_mount+0x66/0xc0 security/security.c:918 path_mount+0x12f/0x1f90 fs/namespace.c:3175 do_mount fs/namespace.c:3246 [inline] __do_sys_mount fs/namespace.c:3454 [inline] __se_sys_mount fs/namespace.c:3431 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3431 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465f69 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f66ea892188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465f69 RDX: 0000000020004280 RSI: 0000000020002040 RDI: 0000000020002000 RBP: 00000000004bfa67 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008 R13: 00007ffd306221df R14: 00007f66ea892300 R15: 0000000000022000