INFO: task syz-executor.2:25779 can't die for more than 143 seconds. syz-executor.2 D27632 25779 7008 0x00004004 Call Trace: context_switch kernel/sched/core.c:3455 [inline] __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4180 schedule+0xd0/0x2a0 kernel/sched/core.c:4255 bit_wait+0x12/0xa0 kernel/sched/wait_bit.c:199 __wait_on_bit+0x60/0x190 kernel/sched/wait_bit.c:49 out_of_line_wait_on_bit+0xd5/0x110 kernel/sched/wait_bit.c:64 wait_on_bit include/linux/wait_bit.h:76 [inline] wait_for_key_construction+0x10b/0x140 security/keys/request_key.c:664 request_key_tag+0x7a/0xb0 security/keys/request_key.c:705 dns_query+0x257/0x6c3 net/dns_resolver/dns_query.c:128 ceph_dns_resolve_name net/ceph/messenger.c:1887 [inline] ceph_parse_server_name net/ceph/messenger.c:1922 [inline] ceph_parse_ips+0x77f/0x8c0 net/ceph/messenger.c:1949 ceph_parse_mon_ips+0x59/0xc0 net/ceph/ceph_common.c:411 ceph_parse_source fs/ceph/super.c:271 [inline] ceph_parse_mount_param+0x1239/0x17e0 fs/ceph/super.c:322 vfs_parse_fs_param fs/fs_context.c:117 [inline] vfs_parse_fs_param+0x203/0x550 fs/fs_context.c:98 vfs_parse_fs_string+0xe6/0x150 fs/fs_context.c:161 do_new_mount fs/namespace.c:2905 [inline] do_mount+0x1222/0x1df0 fs/namespace.c:3237 __do_sys_mount fs/namespace.c:3447 [inline] __se_sys_mount fs/namespace.c:3424 [inline] __x64_sys_mount+0x18f/0x230 fs/namespace.c:3424 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cb19 Code: Bad RIP value. RSP: 002b:00007f67c0048c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f7240 RCX: 000000000045cb19 RDX: 0000000020000040 RSI: 00000000200000c0 RDI: 00000000200001c0 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000771 R14: 00000000004ca736 R15: 00007f67c00496d4 INFO: task syz-executor.2:25779 blocked for more than 144 seconds. Not tainted 5.8.0-rc2-next-20200626-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D27632 25779 7008 0x00004004 Call Trace: context_switch kernel/sched/core.c:3455 [inline] __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4180 schedule+0xd0/0x2a0 kernel/sched/core.c:4255 bit_wait+0x12/0xa0 kernel/sched/wait_bit.c:199 __wait_on_bit+0x60/0x190 kernel/sched/wait_bit.c:49 out_of_line_wait_on_bit+0xd5/0x110 kernel/sched/wait_bit.c:64 wait_on_bit include/linux/wait_bit.h:76 [inline] wait_for_key_construction+0x10b/0x140 security/keys/request_key.c:664 request_key_tag+0x7a/0xb0 security/keys/request_key.c:705 dns_query+0x257/0x6c3 net/dns_resolver/dns_query.c:128 ceph_dns_resolve_name net/ceph/messenger.c:1887 [inline] ceph_parse_server_name net/ceph/messenger.c:1922 [inline] ceph_parse_ips+0x77f/0x8c0 net/ceph/messenger.c:1949 ceph_parse_mon_ips+0x59/0xc0 net/ceph/ceph_common.c:411 ceph_parse_source fs/ceph/super.c:271 [inline] ceph_parse_mount_param+0x1239/0x17e0 fs/ceph/super.c:322 vfs_parse_fs_param fs/fs_context.c:117 [inline] vfs_parse_fs_param+0x203/0x550 fs/fs_context.c:98 vfs_parse_fs_string+0xe6/0x150 fs/fs_context.c:161 do_new_mount fs/namespace.c:2905 [inline] do_mount+0x1222/0x1df0 fs/namespace.c:3237 __do_sys_mount fs/namespace.c:3447 [inline] __se_sys_mount fs/namespace.c:3424 [inline] __x64_sys_mount+0x18f/0x230 fs/namespace.c:3424 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cb19 Code: Bad RIP value. RSP: 002b:00007f67c0048c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f7240 RCX: 000000000045cb19 RDX: 0000000020000040 RSI: 00000000200000c0 RDI: 00000000200001c0 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000771 R14: 00000000004ca736 R15: 00007f67c00496d4 Showing all locks held in the system: 1 lock held by khungtaskd/1152: #0: ffffffff89bc3180 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5779 3 locks held by kworker/1:3/3905: 1 lock held by in:imklog/6469: #0: ffff888093abb370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:928 1 lock held by systemd-udevd/14802: #0: ffff8880ae635e58 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1276 [inline] #0: ffff8880ae635e58 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x22d/0x1eb0 kernel/sched/core.c:4126 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1152 Comm: khungtaskd Not tainted 5.8.0-rc2-next-20200626-syzkaller #0 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+0x18f/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b3/0x223 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:339 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 14839 Comm: systemd-udevd Not tainted 5.8.0-rc2-next-20200626-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:tomoyo_check_acl+0x2e9/0x410 security/tomoyo/domain.c:184 Code: d8 be 08 00 00 00 48 c1 f8 06 49 8d 3c c6 e8 2e f8 50 fe 49 0f a3 1e 44 8d 7b 01 41 0f 92 c4 31 ff 44 89 e6 66 44 89 7c 24 16 92 96 11 fe 45 84 e4 75 57 e8 48 9a 11 fe 48 83 c3 01 44 89 fe RSP: 0018:ffffc9000cc87a98 EFLAGS: 00000246 RAX: 0000000000000001 RBX: 000000000000003e RCX: ffffffff83624f92 RDX: ffffed1014ed13b7 RSI: 00000000a7689d00 RDI: 0000000000000000 RBP: dffffc0000000000 R08: 0000000000000000 R09: ffff8880a7689db7 R10: ffffed1014ed13b6 R11: 0000000000000000 R12: ffff8880a7689d00 R13: ffffc9000cc87bc0 R14: ffff8880a7689db0 R15: 000000000000003f FS: 00007f5fe5d058c0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1a01bae000 CR3: 0000000089769000 CR4: 00000000001526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: tomoyo_path_permission security/tomoyo/file.c:586 [inline] tomoyo_path_permission+0x1f5/0x360 security/tomoyo/file.c:573 tomoyo_path_perm+0x2e7/0x3f0 security/tomoyo/file.c:838 tomoyo_path_unlink+0x8e/0xd0 security/tomoyo/tomoyo.c:150 security_path_unlink+0xd7/0x150 security/security.c:1100 do_unlinkat+0x375/0x660 fs/namei.c:3892 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f5fe4b7a0e7 Code: Bad RIP value. RSP: 002b:00007fffc4203e58 EFLAGS: 00000293 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 00005619c56d4000 RCX: 00007f5fe4b7a0e7 RDX: 00007fffc4203e74 RSI: 00005619c48d47dc RDI: 00007fffc4203e60 RBP: 0000000000000f91 R08: 0000000000000001 R09: 0000000000000014 R10: 0000000000000064 R11: 0000000000000293 R12: 00007fffc4203f70 R13: 00005619c56d4000 R14: 0000000000000003 R15: 000000000000000e