INFO: task syz-executor.1:19836 can't die for more than 143 seconds. task:syz-executor.1 state:D stack:27208 pid:19836 ppid: 11200 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4326 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5077 schedule+0xcf/0x270 kernel/sched/core.c:5156 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+0x132/0x150 kernel/locking/rwsem.c:1407 inode_lock include/linux/fs.h:775 [inline] vfs_removexattr+0xb7/0x250 fs/xattr.c:522 removexattr+0xd0/0x130 fs/xattr.c:819 path_removexattr+0x174/0x1a0 fs/xattr.c:833 __do_sys_lremovexattr fs/xattr.c:853 [inline] __se_sys_lremovexattr fs/xattr.c:850 [inline] __x64_sys_lremovexattr+0x52/0x70 fs/xattr.c:850 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x465b09 RSP: 002b:00007fcc26293188 EFLAGS: 00000246 ORIG_RAX: 00000000000000c6 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465b09 RDX: 0000000000000000 RSI: 0000000020000280 RDI: 0000000020000240 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffd7c46ab4f R14: 00007fcc26293300 R15: 0000000000022000 INFO: task syz-executor.1:19836 blocked for more than 144 seconds. Not tainted 5.11.0-rc6-next-20210204-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:27208 pid:19836 ppid: 11200 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4326 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5077 schedule+0xcf/0x270 kernel/sched/core.c:5156 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+0x132/0x150 kernel/locking/rwsem.c:1407 inode_lock include/linux/fs.h:775 [inline] vfs_removexattr+0xb7/0x250 fs/xattr.c:522 removexattr+0xd0/0x130 fs/xattr.c:819 path_removexattr+0x174/0x1a0 fs/xattr.c:833 __do_sys_lremovexattr fs/xattr.c:853 [inline] __se_sys_lremovexattr fs/xattr.c:850 [inline] __x64_sys_lremovexattr+0x52/0x70 fs/xattr.c:850 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x465b09 RSP: 002b:00007fcc26293188 EFLAGS: 00000246 ORIG_RAX: 00000000000000c6 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465b09 RDX: 0000000000000000 RSI: 0000000020000280 RDI: 0000000020000240 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffd7c46ab4f R14: 00007fcc26293300 R15: 0000000000022000 INFO: task syz-executor.1:19841 can't die for more than 146 seconds. task:syz-executor.1 state:R running task stack:27120 pid:19841 ppid: 11200 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4326 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5077 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:5237 INFO: task syz-executor.1:19861 can't die for more than 147 seconds. task:syz-executor.1 state:D stack:27792 pid:19861 ppid: 11200 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4326 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5077 schedule+0xcf/0x270 kernel/sched/core.c:5156 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+0x132/0x150 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+0x44/0xa9 RIP: 0033:0x465b09 RSP: 002b:00007fcc26230188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056c158 RCX: 0000000000465b09 RDX: 0000000020002100 RSI: 00000000200020c0 RDI: 0000000000000000 RBP: 00000000004b069f R08: 0000000020002140 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c158 R13: 00007ffd7c46ab4f R14: 00007fcc26230300 R15: 0000000000022000 INFO: task syz-executor.1:19861 blocked for more than 149 seconds. Not tainted 5.11.0-rc6-next-20210204-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:27792 pid:19861 ppid: 11200 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4326 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5077 schedule+0xcf/0x270 kernel/sched/core.c:5156 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+0x132/0x150 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+0x44/0xa9 RIP: 0033:0x465b09 RSP: 002b:00007fcc26230188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056c158 RCX: 0000000000465b09 RDX: 0000000020002100 RSI: 00000000200020c0 RDI: 0000000000000000 RBP: 00000000004b069f R08: 0000000020002140 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c158 R13: 00007ffd7c46ab4f R14: 00007fcc26230300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1666: #0: ffffffff8bf6f660 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6326 1 lock held by systemd-udevd/4837: 1 lock held by in:imklog/8122: #0: ffff8880121674f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:961 1 lock held by systemd-udevd/23324: #0: ffff8880b9c35198 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1320 [inline] #0: ffff8880b9c35198 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x217/0x21a0 kernel/sched/core.c:4994 2 locks held by kworker/u4:0/17027: 2 locks held by syz-executor.1/19836: #0: ffff88805bb96460 (sb_writers#21){.+.+}-{0:0}, at: path_removexattr+0xa5/0x1a0 fs/xattr.c:831 #1: ffff888079f61c50 (&type->i_mutex_dir_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888079f61c50 (&type->i_mutex_dir_key#9){++++}-{3:3}, at: vfs_removexattr+0xb7/0x250 fs/xattr.c:522 2 locks held by syz-executor.1/19841: 1 lock held by syz-executor.1/19861: #0: ffff888079f61c50 (&type->i_mutex_dir_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #0: ffff888079f61c50 (&type->i_mutex_dir_key#9){++++}-{3:3}, at: lock_mount+0x8a/0x2e0 fs/namespace.c:2216 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1666 Comm: khungtaskd Not tainted 5.11.0-rc6-next-20210204-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+0x107/0x163 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:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline] watchdog+0xd89/0xf30 kernel/hung_task.c:338 kthread+0x3b1/0x4a0 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: 4826 Comm: systemd-journal Not tainted 5.11.0-rc6-next-20210204-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:match_held_lock+0xa/0x150 kernel/locking/lockdep.c:4961 Code: 0f 1f 44 00 00 48 8b 34 24 48 c7 c7 a0 08 6a 89 e8 c5 7c be ff cc cc cc cc cc cc cc cc cc cc cc 48 39 77 10 0f 84 97 00 00 00 <66> f7 47 22 f0 ff 74 4b 48 83 ec 08 48 8b 46 08 48 85 c0 0f 84 84 RSP: 0018:ffffc900015ffa38 EFLAGS: 00000083 RAX: 0000000000000005 RBX: 0000000000000001 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8bf6f5a0 RDI: ffff888011835db8 RBP: ffffffff8bf6f5a0 R08: 0000000000000000 R09: ffffffff8dc55c4f R10: fffffbfff1b8ab89 R11: 0000000000000001 R12: ffff888011835400 R13: ffff888011835d90 R14: 00000000ffffffff R15: ffff888011835db8 FS: 00007f3abe5788c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3abba25000 CR3: 00000000261a6000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __lock_is_held kernel/locking/lockdep.c:5252 [inline] lock_is_held_type+0xa4/0x120 kernel/locking/lockdep.c:5548 lock_is_held include/linux/lockdep.h:278 [inline] rcu_read_lock_sched_held+0x3a/0x70 kernel/rcu/update.c:125 trace_sched_switch include/trace/events/sched.h:222 [inline] __schedule+0x19de/0x21a0 kernel/sched/core.c:5074 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:5339 irqentry_exit_cond_resched kernel/entry/common.c:393 [inline] irqentry_exit_cond_resched kernel/entry/common.c:385 [inline] irqentry_exit+0x7a/0xa0 kernel/entry/common.c:423 asm_sysvec_reschedule_ipi+0x12/0x20 arch/x86/include/asm/idtentry.h:634 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:197 Code: 00 00 00 4d 8b 0b 48 0f bd c8 49 8b 14 24 48 63 c9 e9 66 ff ff ff 4c 01 ca 49 89 13 e9 00 fd ff ff 66 0f 1f 84 00 00 00 00 00 <65> 8b 05 f9 04 8f 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b RSP: 0018:ffffc900015ffc38 EFLAGS: 00000202 RAX: 00000000001777b3 RBX: 00000000000003de RCX: 1ffffffff1f5c5ba RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000001162 R08: 0000000000000001 R09: ffffffff8faa58c7 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000041 R13: 0000000000000000 R14: ffffffff815ae520 R15: 0000000000000001 devkmsg_poll+0x122/0x1d0 kernel/printk/printk.c:832 vfs_poll include/linux/poll.h:90 [inline] ep_item_poll+0xf4/0x190 fs/eventpoll.c:840 ep_send_events fs/eventpoll.c:1677 [inline] ep_poll fs/eventpoll.c:1792 [inline] do_epoll_wait+0x724/0x1920 fs/eventpoll.c:2220 __do_sys_epoll_wait fs/eventpoll.c:2232 [inline] __se_sys_epoll_wait fs/eventpoll.c:2227 [inline] __x64_sys_epoll_wait+0x158/0x270 fs/eventpoll.c:2227 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f3abd8412e3 Code: 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 83 3d 29 54 2b 00 00 75 13 49 89 ca b8 e8 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 0b c2 00 00 48 89 04 24 RSP: 002b:00007ffe82564758 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8 RAX: ffffffffffffffda RBX: 0000560d48a7e1e0 RCX: 00007f3abd8412e3 RDX: 0000000000000013 RSI: 00007ffe82564760 RDI: 0000000000000008 RBP: 00007ffe82564950 R08: 0000560d48a890d0 R09: 00007ffe8259a080 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffe82564760 R13: 0000000000000001 R14: ffffffffffffffff R15: 0005ba8fe0ffcba3