INFO: task syz-executor.1:9622 can't die for more than 143 seconds. syz-executor.1 D28360 9622 7341 0x00004006 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4222 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 blkdev_put+0x30/0x520 fs/block_dev.c:1929 blkdev_close+0x8c/0xb0 fs/block_dev.c:1978 __fput+0x33e/0x880 fs/file_table.c:280 task_work_run+0xf4/0x1b0 kernel/task_work.c:123 get_signal+0x2058/0x24e0 kernel/signal.c:2529 do_signal+0x81/0x2240 arch/x86/kernel/signal.c:784 exit_to_usermode_loop+0x26c/0x360 arch/x86/entry/common.c:161 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x6b1/0x7d0 arch/x86/entry/common.c:305 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c829 Code: Bad RIP value. RSP: 002b:00007fc1c2dc2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: fffffffffffffe00 RBX: 00000000004e8b80 RCX: 000000000045c829 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 000000000078c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000403 R14: 00000000004c69fa R15: 00007fc1c2dc36d4 INFO: task syz-executor.1:9622 blocked for more than 143 seconds. Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28360 9622 7341 0x00004006 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4222 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 blkdev_put+0x30/0x520 fs/block_dev.c:1929 blkdev_close+0x8c/0xb0 fs/block_dev.c:1978 __fput+0x33e/0x880 fs/file_table.c:280 task_work_run+0xf4/0x1b0 kernel/task_work.c:123 get_signal+0x2058/0x24e0 kernel/signal.c:2529 do_signal+0x81/0x2240 arch/x86/kernel/signal.c:784 exit_to_usermode_loop+0x26c/0x360 arch/x86/entry/common.c:161 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x6b1/0x7d0 arch/x86/entry/common.c:305 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c829 Code: Bad RIP value. RSP: 002b:00007fc1c2dc2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: fffffffffffffe00 RBX: 00000000004e8b80 RCX: 000000000045c829 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 000000000078c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000403 R14: 00000000004c69fa R15: 00007fc1c2dc36d4 INFO: task systemd-udevd:9639 blocked for more than 143 seconds. Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. systemd-udevd D26160 9639 4263 0x00004100 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 io_schedule+0x17/0x60 kernel/sched/core.c:5806 wait_on_page_bit_common+0x351/0xdb0 mm/filemap.c:1153 wait_on_page_bit mm/filemap.c:1202 [inline] wait_on_page_locked include/linux/pagemap.h:528 [inline] wait_on_page_read mm/filemap.c:2738 [inline] do_read_cache_page+0xf95/0x1810 mm/filemap.c:2781 read_mapping_page include/linux/pagemap.h:397 [inline] read_part_sector+0xf6/0x600 block/partitions/core.c:643 adfspart_check_ICS+0x9d/0xc80 block/partitions/acorn.c:360 check_partition block/partitions/core.c:140 [inline] blk_add_partitions+0x474/0xe50 block/partitions/core.c:571 bdev_disk_changed+0x1fb/0x380 fs/block_dev.c:1544 __blkdev_get+0x130c/0x1530 fs/block_dev.c:1682 blkdev_get+0x41/0x2b0 fs/block_dev.c:1749 blkdev_open+0x21d/0x2b0 fs/block_dev.c:1888 do_dentry_open+0x4b6/0x12a0 fs/open.c:797 do_open fs/namei.c:3229 [inline] path_openat+0x1e70/0x27f0 fs/namei.c:3346 do_filp_open+0x192/0x260 fs/namei.c:3373 do_sys_openat2+0x585/0x7d0 fs/open.c:1148 do_sys_open+0xc3/0x140 fs/open.c:1164 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x7f0d7b55f840 Code: Bad RIP value. RSP: 002b:00007ffc62ff4d58 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000055c660d2e8d0 RCX: 00007f0d7b55f840 RDX: 000055c660048fe3 RSI: 00000000000a0800 RDI: 000055c660d281f0 RBP: 00007ffc62ff4ed0 R08: 000055c660048670 R09: 0000000000000010 R10: 000055c660048d0c R11: 0000000000000246 R12: 00007ffc62ff4e20 R13: 000055c660d27dc0 R14: 0000000000000003 R15: 000000000000000e Showing all locks held in the system: 3 locks held by kworker/0:0/5: #0: ffff8880ae6379d8 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1262 [inline] #0: ffff8880ae6379d8 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x233/0x1ff0 kernel/sched/core.c:4034 #1: ffff8880ae622ec8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x304/0x410 kernel/sched/psi.c:817 #2: ffffffff899beea0 (rcu_callback){....}-{0:0}, at: debug_rcu_head_unqueue_bulk kernel/rcu/tree.c:2822 [inline] #2: ffffffff899beea0 (rcu_callback){....}-{0:0}, at: kfree_rcu_work+0x160/0x480 kernel/rcu/tree.c:2853 3 locks held by kworker/u4:4/268: #0: ffff8880ae6379d8 (&rq->lock){-.-.}-{2:2}, at: newidle_balance+0x9be/0xdb0 kernel/sched/fair.c:10512 #1: ffffffff899befc0 (rcu_read_lock){....}-{1:2}, at: __update_idle_core+0x42/0x3e0 kernel/sched/fair.c:5969 #2: ffff8880a8029298 (key#16){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:358 [inline] #2: ffff8880a8029298 (key#16){+...}-{2:2}, at: batadv_nc_purge_paths+0xdf/0x380 net/batman-adv/network-coding.c:441 1 lock held by khungtaskd/1169: #0: ffffffff899befc0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5754 1 lock held by in:imklog/6866: #0: ffff8880a6cc9370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826 1 lock held by syz-executor.1/9622: #0: ffff88808a618980 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x30/0x520 fs/block_dev.c:1929 1 lock held by systemd-udevd/9639: #0: ffff88808a618980 (&bdev->bd_mutex){+.+.}-{3:3}, at: __blkdev_get+0x179/0x1530 fs/block_dev.c:1601 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1169 Comm: khungtaskd Not tainted 5.7.0-rc1-next-20200415-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+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:249 [inline] watchdog+0xde3/0x14e0 kernel/hung_task.c:333 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60