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TITLE: INFO: task hung in synchronize_rcu
TYPE: HANG
[ 348.321211][ T1056] INFO: task syz-executor.2:9976 blocked for more than 143 seconds.
[ 348.329682][ T1056] Not tainted 5.3.0-rc6+ #147
[ 348.335482][ T1056] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 348.344623][ T1056] syz-executor.2 D25560 9976 9905 0x00004004
[ 348.351333][ T1056] Call Trace:
[ 348.354916][ T1056] __schedule+0x755/0x1580
[ 348.375394][ T1056] schedule+0xd9/0x260
[ 348.379651][ T1056] synchronize_rcu_expedited+0x544/0x5b0
[ 348.451454][ T1056] bdi_unregister+0x167/0x5b0
[ 348.478128][ T1056] bdi_put+0x15e/0x190
[ 348.482313][ T1056] generic_shutdown_super+0x2b0/0x370
[ 348.488024][ T1056] kill_anon_super+0x3e/0x60
[ 348.493072][ T1056] fuse_kill_sb_anon+0x1e/0x30
[ 348.498539][ T1056] deactivate_locked_super+0x95/0x100
[ 348.504260][ T1056] deactivate_super+0x1b2/0x1d0
[ 348.536682][ T1056] cleanup_mnt+0x351/0x4b0
[ 348.551705][ T1056] __cleanup_mnt+0x16/0x20
[ 348.556288][ T1056] task_work_run+0x145/0x1c0
[ 348.561245][ T1056] exit_to_usermode_loop+0x316/0x380
[ 348.566831][ T1056] do_syscall_64+0x5a9/0x6a0
[ 348.571653][ T1056] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 348.577798][ T1056] RIP: 0033:0x459879
[ 348.581822][ T1056] Code: 30 48 c7 44 24 38 00 00 00 00 48 c7 44 24 40 00 00 00 00 48 c7 44 24 48 00 00 00 00 e8 b0 67 ff ff 48 8b 44 24 50 48 8b 4c 24 <58> 48 89 01 48 8b 6c 24 60 48 83 c4 68 c3 e8 14 06 fd ff 0f 0b e8
[ 348.603860][ T1056] RSP: 002b:00007f55778a4c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
[ 348.613007][ T1056] RAX: ffffffffffffffea RBX: 0000000000000005 RCX: 0000000000459879
[ 348.621416][ T1056] RDX: 0000000020000080 RSI: 0000000020000040 RDI: 0000000000000000
[ 348.629760][ T1056] RBP: 000000000075bf20 R08: 00000000200001c0 R09: 0000000000000000
[ 348.651558][ T1056] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f55778a56d4
[ 348.659855][ T1056] R13: 00000000004c5e8b R14: 00000000004da9d8 R15: 00000000ffffffff
[ 348.684479][ T1056] INFO: lockdep is turned off.
[ 348.700316][ T1056] NMI backtrace for cpu 0
[ 348.705322][ T1056] CPU: 0 PID: 1056 Comm: khungtaskd Not tainted 5.3.0-rc6+ #147
[ 348.713316][ T1056] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 348.723474][ T1056] Call Trace:
[ 348.726838][ T1056] dump_stack+0x172/0x1f0
[ 348.731515][ T1056] nmi_cpu_backtrace.cold+0x70/0xb2
[ 348.749826][ T1056] nmi_trigger_cpumask_backtrace+0x23b/0x28b
[ 348.755943][ T1056] arch_trigger_cpumask_backtrace+0x14/0x20
[ 348.762479][ T1056] watchdog+0x9d0/0xef0
[ 348.766832][ T1056] kthread+0x361/0x430
[ 348.785271][ T1056] ret_from_fork+0x24/0x30
[ 348.789848][ T1056] Sending NMI from CPU 0 to CPUs 1:
[ 348.795419][ C1] NMI backtrace for cpu 1
[ 348.795428][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0-rc6+ #147
[ 348.795432][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 348.795434][ C1] RIP: 0010:reschedule_interrupt+0x0/0x20
[ 348.795445][ C1] Code: 66 2e 0f 1f 84 00 00 00 00 00 68 03 ff ff ff e8 b6 f0 ff ff e8 c1 23 00 00 e9 ab f1 ff ff 66 90 66 2e 0f 1f 84 00 00 00 00 00 <68> 02 ff ff ff e8 96 f0 ff ff e8 e1 1e 00 00 e9 8b f1 ff ff 66 90
[ 348.795448][ C1] RSP: 0018:ffff8880a98dfd38 EFLAGS: 00000086
[ 348.795453][ C1] RAX: 1ffffffff11a5e8d RBX: ffff8880a98c6340 RCX: 1ffffffff134b5de
[ 348.795457][ C1] RDX: dffffc0000000000 RSI: ffffffff8177f03e RDI: ffffffff873db36c
[ 348.795460][ C1] RBP: ffff8880a98dfd98 R08: ffff8880a98c6340 R09: ffffed1015318c69
[ 348.795463][ C1] R10: ffffed1015318c68 R11: ffff8880a98c6347 R12: dffffc0000000000
[ 348.795466][ C1] R13: ffffffff89a57cf8 R14: 0000000000000000 R15: 0000000000000001
[ 348.795470][ C1] FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
[ 348.795473][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 348.795476][ C1] CR2: ffffffffff600400 CR3: 0000000090e40000 CR4: 00000000001406e0
[ 348.795480][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 348.795483][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 348.795485][ C1] Call Trace:
[ 348.795491][ C1] arch_cpu_idle+0xa/0x10
[ 348.795493][ C1] default_idle_call+0x84/0xb0
[ 348.795495][ C1] do_idle+0x413/0x760
[ 348.795500][ C1] cpu_startup_entry+0x1b/0x20
[ 348.795502][ C1] start_secondary+0x315/0x430
[ 348.795507][ C1] secondary_startup_64+0xa4/0xb0
[ 348.796672][ T1056] Kernel panic - not syncing: hung_task: blocked tasks
[ 348.989545][ T1056] CPU: 0 PID: 1056 Comm: khungtaskd Not tainted 5.3.0-rc6+ #147
[ 348.997469][ T1056] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 349.007812][ T1056] Call Trace:
[ 349.011195][ T1056] dump_stack+0x172/0x1f0
[ 349.015522][ T1056] panic+0x2dc/0x755
[ 349.062252][ T1056] watchdog+0x9e1/0xef0
[ 349.066642][ T1056] kthread+0x361/0x430
[ 349.082864][ T1056] ret_from_fork+0x24/0x30
[ 349.088901][ T1056] Kernel Offset: disabled
[ 349.093412][ T1056] Rebooting in 86400 seconds..
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