INFO: task syz-executor.0:22812 blocked for more than 143 seconds. Not tainted 5.11.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:29368 pid:22812 ppid: 8421 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x999/0xe70 kernel/sched/core.c:5078 schedule+0x14b/0x200 kernel/sched/core.c:5157 rwsem_down_write_slowpath+0xd69/0x1370 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write_nested+0x117/0x120 kernel/locking/rwsem.c:1517 lock_rename+0x182/0x1a0 include/linux/fs.h:808 do_renameat2+0x32d/0x1090 fs/namei.c:4407 __do_sys_rename fs/namei.c:4508 [inline] __se_sys_rename fs/namei.c:4506 [inline] __x64_sys_rename+0x82/0x90 fs/namei.c:4506 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x465b09 RSP: 002b:00007f83589b5188 EFLAGS: 00000246 ORIG_RAX: 0000000000000052 RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465b09 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000020000040 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008 R13: 00007ffee365163f R14: 00007f83589b5300 R15: 0000000000022000 INFO: task syz-executor.0:22821 blocked for more than 143 seconds. Not tainted 5.11.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:28448 pid:22821 ppid: 8421 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x999/0xe70 kernel/sched/core.c:5078 schedule+0x14b/0x200 kernel/sched/core.c:5157 rwsem_down_write_slowpath+0xd69/0x1370 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x112/0x120 kernel/locking/rwsem.c:1407 inode_lock include/linux/fs.h:773 [inline] lock_mount+0x6a/0x2f0 fs/namespace.c:2198 do_new_mount_fc fs/namespace.c:2824 [inline] do_new_mount fs/namespace.c:2883 [inline] path_mount+0x20d1/0x2a00 fs/namespace.c:3211 do_mount fs/namespace.c:3224 [inline] __do_sys_mount fs/namespace.c:3432 [inline] __se_sys_mount+0x28c/0x320 fs/namespace.c:3409 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x465b09 RSP: 002b:00007f8358994188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056c0b0 RCX: 0000000000465b09 RDX: 0000000020002100 RSI: 00000000200042c0 RDI: 0000000000000000 RBP: 00000000004b069f R08: 0000000020002140 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c0b0 R13: 00007ffee365163f R14: 00007f8358994300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1647: #0: ffffffff8c711740 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 1 lock held by in:imklog/8083: 3 locks held by syz-executor.0/22803: 2 locks held by syz-executor.0/22812: #0: ffff888084926460 (sb_writers#16){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:354 #1: ffff8880769c8ed0 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: lock_rename+0x182/0x1a0 include/linux/fs.h:808 1 lock held by syz-executor.0/22821: #0: ffff8880769c8ed0 (&type->i_mutex_dir_key#10){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:773 [inline] #0: ffff8880769c8ed0 (&type->i_mutex_dir_key#10){+.+.}-{3:3}, at: lock_mount+0x6a/0x2f0 fs/namespace.c:2198 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1647 Comm: khungtaskd Not tainted 5.11.0-rc6-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+0x137/0x1be lib/dump_stack.c:120 nmi_cpu_backtrace+0x16c/0x190 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x191/0x2f0 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+0xce9/0xd30 kernel/hung_task.c:294 kthread+0x39a/0x3c0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4865 Comm: systemd-journal Not tainted 5.11.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__preempt_count_add kernel/rcu/tree.c:1109 [inline] RIP: 0010:rcu_is_watching+0x2/0xb0 kernel/rcu/tree.c:1112 Code: 48 8b 04 25 28 00 00 00 48 3b 44 24 10 75 06 48 83 c4 18 5b c3 e8 0e 58 e4 07 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 41 57 <41> 56 53 65 83 05 4f c0 9d 7e 01 e8 0e 69 e4 07 89 c3 83 f8 08 73 RSP: 0018:ffffc90001497df8 EFLAGS: 00000246 RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffff888027038000 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8db396e8 RBP: 0000000000000002 R08: dffffc0000000000 R09: fffffbfff1b672de R10: fffffbfff1b672de R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f8ddb3888c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8dd88492b8 CR3: 0000000027085000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: rcu_read_lock_held_common kernel/rcu/update.c:106 [inline] rcu_read_lock_sched_held+0x23/0xb0 kernel/rcu/update.c:121 trace_lock_acquire+0x6b/0x180 include/trace/events/lock.h:13 lock_acquire+0x39/0x5e0 kernel/locking/lockdep.c:5413 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:259 rcu_read_lock include/linux/rcupdate.h:648 [inline] __task_pid_nr_ns+0x27/0x3e0 kernel/pid.c:497 task_tgid_vnr include/linux/sched.h:1470 [inline] __do_sys_getpid+0x1a/0x20 kernel/sys.c:908 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f8dda620f17 Code: ff ff ff 48 8b 4d a0 0f b7 51 fe 48 8b 4d a8 66 89 54 08 fe e9 1a ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 b8 27 00 00 00 0f 05 0f 1f 84 00 00 00 00 00 b8 6e 00 00 00 0f 05 c3 0f 1f 84 00 00 RSP: 002b:00007ffee06ecc38 EFLAGS: 00000202 ORIG_RAX: 0000000000000027 RAX: ffffffffffffffda RBX: 00005590317601e0 RCX: 00007f8dda620f17 RDX: 0000000000000000 RSI: 000000001eebe6d2 RDI: 00005590317601e0 RBP: 0000000000001301 R08: 00007ffee075e080 R09: 0000000000000070 R10: 00007ffee075e118 R11: 0000000000000202 R12: ffffffffffffffff R13: 00007ffee06ecce8 R14: 0000559030cc7958 R15: 0005ba791643a850