INFO: task syz-executor.1:10767 blocked for more than 143 seconds. Not tainted 5.10.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:25896 pid:10767 ppid: 8495 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3774 [inline] __schedule+0x893/0x2130 kernel/sched/core.c:4523 schedule+0xcf/0x270 kernel/sched/core.c:4601 schedule_timeout+0x148/0x250 kernel/time/timer.c:1876 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:2875 [inline] path_mount+0x13ad/0x20c0 fs/namespace.c:3205 do_mount fs/namespace.c:3218 [inline] __do_sys_mount fs/namespace.c:3426 [inline] __se_sys_mount fs/namespace.c:3403 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3403 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x46089a Code: Unable to access opcode bytes at RIP 0x460870. RSP: 002b:00007f010ea08a88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f010ea08b20 RCX: 000000000046089a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f010ea08ae0 RBP: 00007f010ea08ae0 R08: 00007f010ea08b20 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: ffff8880b9e34dd8 (&rq->lock){-.-.}-{2:2}, at: newidle_balance+0x789/0xe50 kernel/sched/fair.c:10576 #1: ffffffff8b336f60 (rcu_read_lock){....}-{1:2}, at: cpu_of kernel/sched/sched.h:1072 [inline] #1: ffffffff8b336f60 (rcu_read_lock){....}-{1:2}, at: __update_idle_core+0x39/0x430 kernel/sched/fair.c:6018 #2: ffff8880b9e34dd8 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1292 [inline] #2: ffff8880b9e34dd8 (&rq->lock){-.-.}-{2:2}, at: ttwu_queue kernel/sched/core.c:2694 [inline] #2: ffff8880b9e34dd8 (&rq->lock){-.-.}-{2:2}, at: try_to_wake_up+0x535/0x1300 kernel/sched/core.c:2974 1 lock held by khungtaskd/1644: #0: ffffffff8b336f60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6259 2 locks held by systemd-journal/4880: #0: ffff8880b9e34dd8 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1292 [inline] #0: ffff8880b9e34dd8 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x21a/0x2130 kernel/sched/core.c:4441 #1: ffff8880b9e1ff88 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x305/0x440 kernel/sched/psi.c:833 1 lock held by in:imklog/8168: 1 lock held by syz-executor.1/10767: #0: ffff88806801a0e0 (&type->s_umount_key#70/1){+.+.}-{3:3}, at: alloc_super+0x1b8/0xa80 fs/super.c:229 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1644 Comm: khungtaskd Not tainted 5.10.0-rc1-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:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xd43/0xfa0 kernel/hung_task.c:295 kthread+0x3af/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: 8489 Comm: syz-fuzzer Not tainted 5.10.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:filter_irq_stacks+0xb/0x50 lib/stackdepot.c:335 Code: 89 ef e8 88 31 e3 fd e9 dd fe ff ff 4c 89 e7 e8 fb 31 e3 fd e9 12 ff ff ff cc cc cc cc cc cc 85 f6 89 f1 74 3f 41 89 f0 31 c0 <48> 8b 14 c7 89 c6 48 81 fa 00 01 00 89 72 0d 48 81 fa d0 0d 00 89 RSP: 0018:ffffc900016f7580 EFLAGS: 00000016 RAX: 0000000000000006 RBX: ffff888026ec7408 RCX: 0000000000000012 RDX: ffffffff86ed59c5 RSI: 0000000000000005 RDI: ffffc900016f7588 RBP: ffffffff86ed59c5 R08: 0000000000000012 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000800 R13: ffff888140055c00 R14: 0000000000000200 R15: 00000000df3a3de7 FS: 000000c0000cb910(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd46e803000 CR3: 00000000268bf000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kasan_save_stack+0x25/0x40 mm/kasan/common.c:49 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355 __kasan_slab_free+0xd8/0x120 mm/kasan/common.c:422 __cache_free mm/slab.c:3420 [inline] kmem_cache_free+0x53/0x190 mm/slab.c:3695 kfree_skb_partial net/core/skbuff.c:5109 [inline] kfree_skb_partial+0x35/0xa0 net/core/skbuff.c:5105 tcp_rcv_established+0x1b65/0x1eb0 net/ipv4/tcp_input.c:5837 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:000000c0003ef920 EFLAGS: 00000206 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 000000c00002c000 RCX: 00000000004b3d8b RDX: 0000000000001000 RSI: 000000c0000ae000 RDI: 0000000000000006 RBP: 000000c0003ef970 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000003 R13: 000000c000001980 R14: 0000000000000004 R15: ffffffffffffffff