INFO: task syz-executor.1:8846 can't die for more than 143 seconds. task:syz-executor.1 state:D stack:25880 pid: 8846 ppid: 6886 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3773 [inline] __schedule+0xec5/0x2200 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:00007f4e74dfba88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f4e74dfbb20 RCX: 00000000004608aa RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f4e74dfbae0 RBP: 00007f4e74dfbae0 R08: 00007f4e74dfbb20 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000 R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020047a20 INFO: task syz-executor.1:8846 blocked for more than 143 seconds. Not tainted 5.9.0-next-20201021-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:25880 pid: 8846 ppid: 6886 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3773 [inline] __schedule+0xec5/0x2200 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:00007f4e74dfba88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f4e74dfbb20 RCX: 00000000004608aa RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f4e74dfbae0 RBP: 00007f4e74dfbae0 R08: 00007f4e74dfbb20 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/u4:4/154: #0: ffff8880ae436198 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1292 [inline] #0: ffff8880ae436198 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x284/0x2200 kernel/sched/core.c:4440 #1: ffff8880ae420ec8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x305/0x440 kernel/sched/psi.c:833 #2: ffff888060770d00 (&wdev->mtx){+.+.}-{3:3}, at: sdata_lock net/mac80211/ieee80211_i.h:1021 [inline] #2: ffff888060770d00 (&wdev->mtx){+.+.}-{3:3}, at: ieee80211_ibss_work+0x93/0xe80 net/mac80211/ibss.c:1683 1 lock held by khungtaskd/1176: #0: ffffffff8a554de0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6259 3 locks held by kworker/0:2/2555: #0: ffff8880ae436198 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1292 [inline] #0: ffff8880ae436198 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x284/0x2200 kernel/sched/core.c:4440 #1: ffff8880ae420ec8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x305/0x440 kernel/sched/psi.c:833 #2: ffffffff8dcc9fa0 (&obj_hash[i].lock){-.-.}-{2:2}, at: __debug_check_no_obj_freed lib/debugobjects.c:975 [inline] #2: ffffffff8dcc9fa0 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_check_no_obj_freed+0xc7/0x420 lib/debugobjects.c:1018 1 lock held by in:imklog/6554: #0: ffff888015752430 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:932 1 lock held by syz-executor.1/8846: #0: ffff88801a1680e0 (&type->s_umount_key#56/1){+.+.}-{3:3}, at: alloc_super+0x201/0xaf0 fs/super.c:229 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1176 Comm: khungtaskd Not tainted 5.9.0-next-20201021-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+0x198/0x1fb 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 2555 Comm: kworker/0:2 Not tainted 5.9.0-next-20201021-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events nsim_dev_trap_report_work RIP: 0010:iterate_chain_key kernel/locking/lockdep.c:418 [inline] RIP: 0010:__lock_acquire+0xc7b/0x5590 kernel/locking/lockdep.c:4825 Code: f2 01 d0 29 d7 89 d6 48 8b 54 24 28 c1 c6 04 31 fe 48 c1 e6 20 48 09 c6 48 c1 ea 03 48 b8 00 00 00 00 00 fc ff df 0f b6 04 02 <49> 89 f6 84 c0 74 08 3c 03 0f 8e 80 44 00 00 8b 45 20 25 00 80 04 RSP: 0018:ffffc900089bf8d0 EFLAGS: 00000802 RAX: 0000000000000000 RBX: 0000000020377db5 RCX: 000000008fc39d4f RDX: 1ffff110032e155b RSI: 91c2410fbd05d386 RDI: 000000008dffc50f RBP: ffff88801970aab8 R08: 0000000000000000 R09: ffffffff8d742a57 R10: fffffbfff1ae854a R11: 0000000000000000 R12: ffff88801970a100 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc545cb4000 CR3: 00000000261e6000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire kernel/locking/lockdep.c:5442 [inline] lock_acquire+0x219/0x9d0 kernel/locking/lockdep.c:5407 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x94/0xd0 kernel/locking/spinlock.c:159 _crng_backtrack_protect+0x71/0x1a0 drivers/char/random.c:1045 crng_backtrack_protect drivers/char/random.c:1063 [inline] _get_random_bytes+0x295/0x670 drivers/char/random.c:1565 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:533 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:562 [inline] nsim_dev_trap_report_work+0x74e/0xbd0 drivers/net/netdevsim/dev.c:603 process_one_work+0x933/0x15a0 kernel/workqueue.c:2272 worker_thread+0x64c/0x1120 kernel/workqueue.c:2418 kthread+0x3af/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296