INFO: task syz-executor.0:11017 can't die for more than 143 seconds. task:syz-executor.0 state:D stack:26128 pid:11017 ppid: 8500 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3773 [inline] __schedule+0x893/0x2130 kernel/sched/core.c:4522 schedule+0xcf/0x270 kernel/sched/core.c:4600 schedule_timeout+0x148/0x250 kernel/time/timer.c:1881 gfs2_gl_hash_clear+0x240/0x270 fs/gfs2/glock.c:1989 gfs2_fill_super+0x1e81/0x23f0 fs/gfs2/ops_fstype.c:1233 get_tree_bdev+0x421/0x740 fs/super.c:1344 gfs2_get_tree+0x4a/0x270 fs/gfs2/ops_fstype.c:1256 vfs_get_tree+0x89/0x2f0 fs/super.c:1549 do_new_mount fs/namespace.c:2896 [inline] path_mount+0x12ae/0x1e70 fs/namespace.c:3227 do_mount fs/namespace.c:3240 [inline] __do_sys_mount fs/namespace.c:3448 [inline] __se_sys_mount fs/namespace.c:3425 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3425 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4608aa Code: Unable to access opcode bytes at RIP 0x460880. RSP: 002b:00007f16b1606a88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f16b1606b20 RCX: 00000000004608aa RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f16b1606ae0 RBP: 00007f16b1606ae0 R08: 00007f16b1606b20 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000 R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020047a20 INFO: task syz-executor.0:11017 blocked for more than 143 seconds. Not tainted 5.9.0-next-20201022-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:26128 pid:11017 ppid: 8500 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3773 [inline] __schedule+0x893/0x2130 kernel/sched/core.c:4522 schedule+0xcf/0x270 kernel/sched/core.c:4600 schedule_timeout+0x148/0x250 kernel/time/timer.c:1881 gfs2_gl_hash_clear+0x240/0x270 fs/gfs2/glock.c:1989 gfs2_fill_super+0x1e81/0x23f0 fs/gfs2/ops_fstype.c:1233 get_tree_bdev+0x421/0x740 fs/super.c:1344 gfs2_get_tree+0x4a/0x270 fs/gfs2/ops_fstype.c:1256 vfs_get_tree+0x89/0x2f0 fs/super.c:1549 do_new_mount fs/namespace.c:2896 [inline] path_mount+0x12ae/0x1e70 fs/namespace.c:3227 do_mount fs/namespace.c:3240 [inline] __do_sys_mount fs/namespace.c:3448 [inline] __se_sys_mount fs/namespace.c:3425 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3425 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4608aa Code: Unable to access opcode bytes at RIP 0x460880. RSP: 002b:00007f16b1606a88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f16b1606b20 RCX: 00000000004608aa RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f16b1606ae0 RBP: 00007f16b1606ae0 R08: 00007f16b1606b20 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000 R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020047a20 Showing all locks held in the system: 3 locks held by kworker/u4:0/7: #0: ffff8880b9f34cd8 (&rq->lock){-.-.}-{2:2}, at: newidle_balance+0x789/0xe50 kernel/sched/fair.c:10576 #1: ffffffff8b3361a0 (rcu_read_lock){....}-{1:2}, at: cpu_of kernel/sched/sched.h:1072 [inline] #1: ffffffff8b3361a0 (rcu_read_lock){....}-{1:2}, at: __update_idle_core+0x39/0x430 kernel/sched/fair.c:6018 #2: ffff8880b9f246d8 (&base->lock){..-.}-{2:2}, at: lock_timer_base+0x5a/0x1f0 kernel/time/timer.c:949 1 lock held by khungtaskd/1654: #0: ffffffff8b3361a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6259 1 lock held by in:imklog/8174: #0: ffff8880115a59f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:932 1 lock held by syz-executor.0/11017: #0: ffff888065a4a0e0 (&type->s_umount_key#57/1){+.+.}-{3:3}, at: alloc_super+0x201/0xaf0 fs/super.c:229 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1654 Comm: khungtaskd Not tainted 5.9.0-next-20201022-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+0x107/0x163 lib/dump_stack.c:118 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:339 kthread+0x3af/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8496 Comm: syz-fuzzer Not tainted 5.9.0-next-20201022-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__orc_find+0x47/0xf0 arch/x86/kernel/unwind_orc.c:50 Code: 4c 39 e7 49 89 fd 0f 87 9a 00 00 00 49 bf 00 00 00 00 00 fc ff df 49 89 fe 48 89 fd eb 0c 48 8d 6b 04 49 89 de 49 39 ec 72 4d <4c> 89 e0 48 29 e8 48 89 c2 48 c1 e8 3f 48 c1 fa 02 48 01 d0 48 d1 RSP: 0018:ffffc9000186e958 EFLAGS: 00000246 RAX: ffffffff88e3a4f1 RBX: ffffffff8d5a70b4 RCX: ffffffff88e3a51c RDX: 0000000000000000 RSI: ffffffff8df5480a RDI: ffffffff8d5a70b4 RBP: ffffffff8d5a70b8 R08: ffffffff8df5485e R09: ffffffff8df5480a R10: 0000000000082081 R11: 000000000019315b R12: ffffffff8d5a70b8 R13: ffffffff8d5a70b4 R14: ffffffff8d5a70b4 R15: dffffc0000000000 FS: 000000c000158b10(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7a6b931000 CR3: 0000000013f8c000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: orc_find arch/x86/kernel/unwind_orc.c:173 [inline] unwind_next_frame+0x342/0x1f90 arch/x86/kernel/unwind_orc.c:443 arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355 __kasan_slab_free+0x102/0x140 mm/kasan/common.c:422 slab_free_hook mm/slub.c:1544 [inline] slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1577 slab_free mm/slub.c:3142 [inline] kmem_cache_free+0x82/0x350 mm/slub.c:3158 kfree_skbmem+0xef/0x1b0 net/core/skbuff.c:622 __kfree_skb net/core/skbuff.c:679 [inline] consume_skb net/core/skbuff.c:834 [inline] consume_skb+0xcf/0x160 net/core/skbuff.c:828 packet_rcv+0xea/0x13b0 net/packet/af_packet.c:2159 dev_queue_xmit_nit+0x7f6/0xac0 net/core/dev.c:2362 xmit_one net/core/dev.c:3558 [inline] dev_hard_start_xmit+0xa4/0x880 net/core/dev.c:3578 sch_direct_xmit+0x2e1/0xbd0 net/sched/sch_generic.c:313 qdisc_restart net/sched/sch_generic.c:376 [inline] __qdisc_run+0x4ba/0x15e0 net/sched/sch_generic.c:384 qdisc_run include/net/pkt_sched.h:131 [inline] qdisc_run include/net/pkt_sched.h:123 [inline] __dev_xmit_skb net/core/dev.c:3753 [inline] __dev_queue_xmit+0x13fd/0x2d30 net/core/dev.c:4106 neigh_hh_output include/net/neighbour.h:498 [inline] neigh_output include/net/neighbour.h:507 [inline] ip_finish_output2+0xe95/0x2120 net/ipv4/ip_output.c:230 __ip_finish_output net/ipv4/ip_output.c:308 [inline] __ip_finish_output+0x7cf/0xd10 net/ipv4/ip_output.c:290 ip_finish_output+0x34/0x1f0 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:290 [inline] ip_output+0x196/0x310 net/ipv4/ip_output.c:432 dst_output include/net/dst.h:443 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] __ip_queue_xmit+0x8e9/0x1a00 net/ipv4/ip_output.c:532 __tcp_transmit_skb+0x18cc/0x3760 net/ipv4/tcp_output.c:1404 __tcp_send_ack.part.0+0x3d6/0x750 net/ipv4/tcp_output.c:3967 __tcp_send_ack net/ipv4/tcp_output.c:3973 [inline] tcp_send_ack+0x7d/0xa0 net/ipv4/tcp_output.c:3973 __tcp_ack_snd_check+0x156/0x9c0 net/ipv4/tcp_input.c:5400 tcp_rcv_established+0x18e0/0x1e40 net/ipv4/tcp_input.c:5832 tcp_v4_do_rcv+0x5d1/0x870 net/ipv4/tcp_ipv4.c:1652 sk_backlog_rcv include/net/sock.h:1010 [inline] __release_sock+0x134/0x3a0 net/core/sock.c:2523 release_sock+0x54/0x1b0 net/core/sock.c:3053 tcp_recvmsg+0x987/0x2910 net/ipv4/tcp.c:2251 inet_recvmsg+0x11b/0x5d0 net/ipv4/af_inet.c:848 sock_recvmsg_nosec net/socket.c:885 [inline] sock_recvmsg net/socket.c:903 [inline] sock_recvmsg net/socket.c:899 [inline] sock_read_iter+0x33c/0x470 net/socket.c:976 call_read_iter include/linux/fs.h:1881 [inline] new_sync_read+0x5b7/0x6e0 fs/read_write.c:415 vfs_read+0x35c/0x570 fs/read_write.c:496 ksys_read+0x1ee/0x250 fs/read_write.c:634 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4b3d8b Code: ff e9 69 ff ff ff cc cc cc cc cc cc cc cc cc e8 db a1 f8 ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 RSP: 002b:000000c000145920 EFLAGS: 00000206 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 000000c00002c000 RCX: 00000000004b3d8b RDX: 0000000000001000 RSI: 000000c00033a000 RDI: 0000000000000006 RBP: 000000c000145970 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000003 R13: 000000c000082600 R14: 00000091b189fa96 R15: ffffffffffffffff