INFO: task syz-executor.0:16569 can't die for more than 143 seconds. syz-executor.0 D25200 16569 6845 0x00004004 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 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: 0033:0x45cb29 Code: Bad RIP value. RSP: 002b:00007f92cde6bc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f72e0 RCX: 000000000045cb29 RDX: 0000000020000140 RSI: 00000000200000c0 RDI: 0000000020000100 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000772 R14: 00000000004ca761 R15: 00007f92cde6c6d4 INFO: task syz-executor.0:16569 blocked for more than 143 seconds. Not tainted 5.8.0-rc3-next-20200701-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D25200 16569 6845 0x00004004 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 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: 0033:0x45cb29 Code: Bad RIP value. RSP: 002b:00007f92cde6bc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f72e0 RCX: 000000000045cb29 RDX: 0000000020000140 RSI: 00000000200000c0 RDI: 0000000020000100 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000772 R14: 00000000004ca761 R15: 00007f92cde6c6d4 Showing all locks held in the system: 1 lock held by khungtaskd/1146: #0: ffffffff89bc3000 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5779 1 lock held by in:imklog/6559: #0: ffff8880a724ad70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:928 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1146 Comm: khungtaskd Not tainted 5.8.0-rc3-next-20200701-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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3870 Comm: systemd-journal Not tainted 5.8.0-rc3-next-20200701-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kasan_poison_shadow mm/kasan/common.c:128 [inline] RIP: 0010:kasan_unpoison_shadow+0x3/0x40 mm/kasan/common.c:144 Code: df 41 89 d0 48 89 f8 48 8d 14 37 48 c1 e8 03 41 0f b6 f0 48 8d 3c 08 48 c1 ea 03 48 29 c2 e9 94 ba 00 02 0f 1f 40 00 49 89 f8 <48> 01 f7 55 48 89 f5 48 c1 ef 03 53 49 c1 e8 03 31 f6 48 bb 00 00 RSP: 0018:ffffc90001647d80 EFLAGS: 00000282 RAX: ffff8880a91886df RBX: ffff8880a91886e0 RCX: 0000000000000400 RDX: 0000000000000020 RSI: 0000000000000020 RDI: ffff8880a91886c0 RBP: 0000000000400dc0 R08: ffff8880a91886c0 R09: ffff8880a91886c0 R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880a91886c0 R13: ffff8880a91886df R14: ffff8880aa000100 R15: 0000000000000020 FS: 00007fa9ce3b48c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa9cb8d7000 CR3: 0000000094233000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __kasan_kmalloc.constprop.0+0x4b/0xd0 mm/kasan/common.c:489 slab_post_alloc_hook mm/slab.h:535 [inline] slab_alloc mm/slab.c:3316 [inline] __do_kmalloc mm/slab.c:3657 [inline] __kmalloc+0x174/0x4d0 mm/slab.c:3668 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:666 [inline] lsm_cred_alloc security/security.c:532 [inline] security_prepare_creds+0x10e/0x190 security/security.c:1616 prepare_creds+0x4bd/0x6c0 kernel/cred.c:285 access_override_creds fs/open.c:353 [inline] do_faccessat+0x3d7/0x820 fs/open.c:417 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fa9cd6709c7 Code: Bad RIP value. RSP: 002b:00007ffe45440a38 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007ffe45443950 RCX: 00007fa9cd6709c7 RDX: 00007fa9ce0e1a00 RSI: 0000000000000000 RDI: 000055cf2062a9a3 RBP: 00007ffe45440a70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffe45443950 R15: 00007ffe45440f60