INFO: task syz-executor.3:12287 can't die for more than 143 seconds. task:syz-executor.3 state:D stack:26128 pid:12287 ppid: 8502 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: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: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:00007f6f2b8caa88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f6f2b8cab20 RCX: 00000000004608aa RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f6f2b8caae0 RBP: 00007f6f2b8caae0 R08: 00007f6f2b8cab20 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000 R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020047a20 INFO: task syz-executor.3:12287 blocked for more than 143 seconds. Not tainted 5.10.0-rc1-next-20201027-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:26128 pid:12287 ppid: 8502 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: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: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:00007f6f2b8caa88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f6f2b8cab20 RCX: 00000000004608aa RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f6f2b8caae0 RBP: 00007f6f2b8caae0 R08: 00007f6f2b8cab20 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000 R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020047a20 Showing all locks held in the system: 1 lock held by khungtaskd/1597: #0: ffffffff8b337d60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6259 2 locks held by in:imklog/8183: #0: ffff8880132ff9f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:932 #1: ffffffff8f0e48a8 (&obj_hash[i].lock){-.-.}-{2:2}, at: double_lock_hb kernel/futex.c:1565 [inline] #1: ffffffff8f0e48a8 (&obj_hash[i].lock){-.-.}-{2:2}, at: futex_wake_op kernel/futex.c:1698 [inline] #1: ffffffff8f0e48a8 (&obj_hash[i].lock){-.-.}-{2:2}, at: do_futex+0x566/0x1a20 kernel/futex.c:3761 2 locks held by agetty/8411: #0: ffff88802100c098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:266 #1: ffffc90000f782e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x223/0x1a20 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.3/12287: #0: ffff8880546440e0 (&type->s_umount_key#54/1){+.+.}-{3:3}, at: alloc_super+0x201/0xaf0 fs/super.c:229 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1597 Comm: khungtaskd Not tainted 5.10.0-rc1-next-20201027-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: 27 Comm: kworker/u4:2 Not tainted 5.10.0-rc1-next-20201027-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: 0x0 (phy15) RIP: 0010:check_memory_region+0x16/0x180 mm/kasan/generic.c:191 Code: 02 0f 1f 00 48 89 f2 be f8 00 00 00 e9 23 bb 21 02 0f 1f 00 48 85 f6 0f 84 70 01 00 00 49 89 f9 41 54 44 0f b6 c2 49 01 f1 55 <53> 0f 82 18 01 00 00 48 b8 ff ff ff ff ff 7f ff ff 48 39 c7 0f 86 RSP: 0018:ffffc90000e1fa30 EFLAGS: 00000086 RAX: 0000000000000002 RBX: 000000000000009c RCX: ffffffff8155e5c8 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8ebb1670 RBP: ffff888010fc3e40 R08: 0000000000000000 R09: ffffffff8ebb1678 R10: fffffbfff1d762ce R11: 0000000000000000 R12: ffff888010fc3500 R13: ffff888010fc3e62 R14: 0000000000000000 R15: 0000000000040000 FS: 0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f51f07b1000 CR3: 0000000024e0e000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: instrument_atomic_read include/linux/instrumented.h:71 [inline] test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] __lock_acquire+0xfd8/0x5590 kernel/locking/lockdep.c:4807 lock_acquire kernel/locking/lockdep.c:5442 [inline] lock_acquire+0x1af/0x8b0 kernel/locking/lockdep.c:5407 write_seqcount_t_begin_nested include/linux/seqlock.h:515 [inline] write_seqcount_t_begin include/linux/seqlock.h:541 [inline] psi_group_change+0x126/0x870 kernel/sched/psi.c:707 psi_task_change+0x142/0x220 kernel/sched/psi.c:807 psi_dequeue kernel/sched/stats.h:108 [inline] dequeue_task kernel/sched/core.c:1582 [inline] deactivate_task kernel/sched/core.c:1600 [inline] __schedule+0x18c3/0x2130 kernel/sched/core.c:4480 schedule+0xcf/0x270 kernel/sched/core.c:4600 worker_thread+0x14c/0x1120 kernel/workqueue.c:2439 kthread+0x3af/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296