INFO: task syz-executor2:11554 blocked for more than 140 seconds. Not tainted 4.19.0-rc8+ #284 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D24424 11554 5364 0x00100004 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3473 schedule+0xfe/0x460 kernel/sched/core.c:3517 request_wait_answer+0x4a6/0x900 fs/fuse/dev.c:474 __fuse_request_send+0x12a/0x1d0 fs/fuse/dev.c:494 fuse_request_send+0x62/0xa0 fs/fuse/dev.c:507 fuse_simple_request+0x33d/0x730 fs/fuse/dev.c:565 fuse_getxattr+0x42f/0x760 fs/fuse/xattr.c:80 fuse_get_acl+0x1be/0x360 fs/fuse/acl.c:35 get_acl+0x16b/0x2a0 fs/posix_acl.c:140 posix_acl_xattr_get+0xff/0x1d0 fs/posix_acl.c:844 __vfs_getxattr+0xee/0x150 fs/xattr.c:310 vfs_getxattr+0x275/0x390 fs/xattr.c:341 getxattr+0x139/0x2c0 fs/xattr.c:537 path_getxattr+0x103/0x1b0 fs/xattr.c:565 __do_sys_getxattr fs/xattr.c:577 [inline] __se_sys_getxattr fs/xattr.c:574 [inline] __x64_sys_getxattr+0x9d/0x100 fs/xattr.c:574 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457569 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f0579ae6c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000bf RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457569 RDX: 0000000020000540 RSI: 0000000020000680 RDI: 00000000200000c0 RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000044 R11: 0000000000000246 R12: 00007f0579ae76d4 R13: 00000000004bdd7d R14: 00000000004ce278 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/982: #0: 000000003b4f87d3 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4435 1 lock held by rsyslogd/5210: #0: 0000000008cfb9f0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 2 locks held by getty/5300: #0: 0000000052825715 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000374ff863 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5301: #0: 00000000ca3879c6 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000d23627b9 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5302: #0: 000000006556eec9 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000008f1f2ad0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5303: #0: 00000000052c11a7 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000d953ae7f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5304: #0: 00000000bae26c49 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000835fe9f9 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5305: #0: 00000000b0b6d8d0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000a8ea4761 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5306: #0: 000000005c42a60c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000b1824b90 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by syz-executor1/20123: #0: 000000006630ad4e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000049d531c8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 4 locks held by udevd/19519: #0: 0000000010222dba (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1822 [inline] #0: 0000000010222dba (&rq->lock){-.-.}, at: __schedule+0x236/0x1ed0 kernel/sched/core.c:3411 #1: 000000003b4f87d3 (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:413 [inline] #1: 000000003b4f87d3 (rcu_read_lock){....}, at: update_curr+0x383/0xbe0 kernel/sched/fair.c:829 #2: 00000000383199ad (&ep->wq){..-.}, at: ep_poll_callback+0x165/0x10e0 fs/eventpoll.c:1129 #3: 00000000ff0f5b73 (&p->pi_lock){-.-.}, at: try_to_wake_up+0xd2/0x12f0 kernel/sched/core.c:1960 2 locks held by syz-executor1/22379: #0: 00000000247241d5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000089535a15 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 1 lock held by syz-executor3/28717: #0: 000000003c9b3a9c (rtnl_mutex){+.+.}, at: rtnl_lock net/core/rtnetlink.c:77 [inline] #0: 000000003c9b3a9c (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x40e/0xc20 net/core/rtnetlink.c:4727 1 lock held by syz-executor4/28702: 1 lock held by syz-executor0/28711: #0: 0000000010222dba (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1822 [inline] #0: 0000000010222dba (&rq->lock){-.-.}, at: __schedule+0x236/0x1ed0 kernel/sched/core.c:3411 1 lock held by syz-executor0/28714: #0: 000000003c9b3a9c ( rtnl_mutex){+.+.}, at: rtnl_lock net/core/rtnetlink.c:77 [inline] rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x40e/0xc20 net/core/rtnetlink.c:4727 1 lock held by syz-executor5/28724: #0: 000000003c9b3a9c (rtnl_mutex){+.+.}, at: rtnl_lock net/core/rtnetlink.c:77 [inline] #0: 000000003c9b3a9c (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x40e/0xc20 net/core/rtnetlink.c:4727 1 lock held by udevd/28725: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 982 Comm: khungtaskd Not tainted 4.19.0-rc8+ #284 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c4/0x2b4 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.3+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b3/0x1ed lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:144 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline] watchdog+0xb3e/0x1050 kernel/hung_task.c:265 kthread+0x35a/0x420 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 28701 Comm: syz-executor4 Not tainted 4.19.0-rc8+ #284 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lockdep_hardirqs_on+0x292/0x5c0 kernel/locking/lockdep.c:2880 Code: a3 40 08 00 00 65 48 8b 1c 25 40 ee 01 00 48 8d bb 7c 08 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 2e 02 00 00 c7 RSP: 0018:ffff88002eb3fe30 EFLAGS: 00000803 RAX: dffffc0000000000 RBX: ffff88007c470580 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88007c470dfc RBP: ffff88002eb3fe40 R08: ffff88007c470580 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000cf9 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000002242940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000072c000 CR3: 0000000028a7a000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_hardirqs_on_caller+0xc0/0x310 kernel/trace/trace_preemptirq.c:56 trace_hardirqs_on_thunk+0x1a/0x1c entry_SYSCALL_64_after_hwframe+0x59/0xbe RIP: 0033:0x45a3ca Code: 25 18 00 00 00 00 74 01 f0 48 0f b1 3d bf c0 5e 00 48 39 c2 75 da f3 c3 0f 1f 84 00 00 00 00 00 48 63 ff b8 e4 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 f3 c3 0f 1f 40 00 48 c7 c2 d4 ff ff ff f7 RSP: 002b:0000000000a3fbc8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e4 RAX: 0000000000000000 RBX: 000000000072bf00 RCX: 000000000045a3ca RDX: 0000000000000000 RSI: 0000000000a3fbd0 RDI: 0000000000000001 RBP: 000000000000002d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000a3fcc0 R11: 0000000000000246 R12: 000000000072bf0c R13: 00000000000003e8 R14: 000000000024f439 R15: 000000000024f40c