INFO: task systemd-udevd:5171 blocked for more than 143 seconds. Not tainted 5.8.0-rc5-next-20200716-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. systemd-udevd D26800 5171 3902 0x00004100 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 io_schedule+0xb5/0x120 kernel/sched/core.c:5935 wait_on_page_bit_common+0x34f/0xda0 mm/filemap.c:1124 wait_on_page_bit mm/filemap.c:1173 [inline] wait_on_page_locked include/linux/pagemap.h:643 [inline] wait_on_page_read mm/filemap.c:2790 [inline] do_read_cache_page+0x957/0x1390 mm/filemap.c:2833 read_mapping_page include/linux/pagemap.h:437 [inline] read_part_sector+0xf6/0x5af block/partitions/core.c:770 adfspart_check_ICS+0x9d/0xc90 block/partitions/acorn.c:360 check_partition block/partitions/core.c:140 [inline] blk_add_partitions+0x44b/0xe10 block/partitions/core.c:698 bdev_disk_changed+0x1ea/0x370 fs/block_dev.c:1488 __blkdev_get+0x142b/0x16e0 fs/block_dev.c:1624 blkdev_get+0x45/0x4d0 fs/block_dev.c:1689 blkdev_open+0x21d/0x2b0 fs/block_dev.c:1831 do_dentry_open+0x4b9/0x11b0 fs/open.c:822 do_open fs/namei.c:3249 [inline] path_openat+0x1b97/0x2720 fs/namei.c:3366 do_filp_open+0x17e/0x3c0 fs/namei.c:3393 do_sys_openat2+0x16d/0x3e0 fs/open.c:1173 do_sys_open fs/open.c:1189 [inline] ksys_open include/linux/syscalls.h:1398 [inline] __do_sys_open fs/open.c:1195 [inline] __se_sys_open fs/open.c:1193 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1193 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fd71a3b2840 Code: Bad RIP value. RSP: 002b:00007ffff0c6ac38 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000560309556980 RCX: 00007fd71a3b2840 RDX: 0000560309173fe3 RSI: 00000000000a0800 RDI: 0000560309554160 RBP: 00007ffff0c6adb0 R08: 0000560309173670 R09: 0000000000000010 R10: 0000560309173d0c R11: 0000000000000246 R12: 00007ffff0c6ad00 R13: 0000560309556e80 R14: 0000000000000003 R15: 000000000000000e INFO: task syz-executor.0:6225 can't die for more than 143 seconds. syz-executor.0 D28736 6225 6835 0x00004006 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4303 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 blkdev_put+0x30/0x520 fs/block_dev.c:1882 blkdev_close+0x8c/0xb0 fs/block_dev.c:1931 __fput+0x27e/0x8e0 fs/file_table.c:281 task_work_run+0xdd/0x190 kernel/task_work.c:135 get_signal+0xd6c/0x1ee0 kernel/signal.c:2547 do_signal+0x82/0x2520 arch/x86/kernel/signal.c:810 exit_to_usermode_loop arch/x86/entry/common.c:235 [inline] __prepare_exit_to_usermode+0x14d/0x1f0 arch/x86/entry/common.c:269 do_syscall_64+0x6c/0xe0 arch/x86/entry/common.c:393 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c1d9 Code: Bad RIP value. RSP: 002b:00007fee084b0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 0000000000010b00 RCX: 000000000045c1d9 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 000000000078bf38 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007ffe33ef27ff R14: 00007fee084b19c0 R15: 000000000078bf0c INFO: task syz-executor.0:6225 blocked for more than 144 seconds. Not tainted 5.8.0-rc5-next-20200716-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28736 6225 6835 0x00004006 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4303 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 blkdev_put+0x30/0x520 fs/block_dev.c:1882 blkdev_close+0x8c/0xb0 fs/block_dev.c:1931 __fput+0x27e/0x8e0 fs/file_table.c:281 task_work_run+0xdd/0x190 kernel/task_work.c:135 get_signal+0xd6c/0x1ee0 kernel/signal.c:2547 do_signal+0x82/0x2520 arch/x86/kernel/signal.c:810 exit_to_usermode_loop arch/x86/entry/common.c:235 [inline] __prepare_exit_to_usermode+0x14d/0x1f0 arch/x86/entry/common.c:269 do_syscall_64+0x6c/0xe0 arch/x86/entry/common.c:393 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c1d9 Code: Bad RIP value. RSP: 002b:00007fee084b0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 0000000000010b00 RCX: 000000000045c1d9 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 000000000078bf38 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007ffe33ef27ff R14: 00007fee084b19c0 R15: 000000000078bf0c Showing all locks held in the system: 3 locks held by kworker/u4:2/26: #0: ffff8880ae635e18 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1276 [inline] #0: ffff8880ae635e18 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x230/0x1e80 kernel/sched/core.c:4115 #1: ffff8880ae620ec8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x2fb/0x400 kernel/sched/psi.c:833 #2: ffff8880ae6255d8 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x55/0x1a0 kernel/time/timer.c:935 1 lock held by khungtaskd/1152: #0: ffffffff89c53980 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5779 1 lock held by in:imklog/6531: 1 lock held by systemd-udevd/5171: #0: ffff888098aa36c0 (&bdev->bd_mutex){+.+.}-{3:3}, at: __blkdev_get+0x164/0x16e0 fs/block_dev.c:1543 1 lock held by syz-executor.0/6225: #0: ffff888098aa36c0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x30/0x520 fs/block_dev.c:1882 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1152 Comm: khungtaskd Not tainted 5.8.0-rc5-next-20200716-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+0x18f/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x223 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+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3897 Comm: systemd-journal Not tainted 5.8.0-rc5-next-20200716-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline] RIP: 0010:write_comp_data+0x13/0x80 kernel/kcov.c:218 Code: 48 8b 80 00 14 00 00 c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 49 89 f2 65 8b 05 56 d3 8d 7e 65 48 8b 34 25 c0 fe 01 00 00 01 ff 00 74 0f f6 c4 01 74 59 8b 86 0c 14 00 00 85 c0 74 4f RSP: 0018:ffffc90000da8bd8 EFLAGS: 00000046 RAX: 0000000080010002 RBX: 0000000000000000 RCX: ffffffff8398b20a RDX: 0000000000000002 RSI: ffff888093bfc280 RDI: 0000000000000007 RBP: 0000000000000002 R08: 0000000000000000 R09: ffffffff8bf3304f R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000040 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 FS: 00007f885890d8c0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8854e9d000 CR3: 0000000093b27000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: _find_next_bit.constprop.0+0xca/0x200 lib/find_bit.c:53 cpumask_next lib/cpumask.c:23 [inline] cpumask_next_wrap+0x62/0xf0 lib/cpumask.c:83 select_idle_cpu kernel/sched/fair.c:6147 [inline] select_idle_sibling kernel/sched/fair.c:6271 [inline] select_task_rq_fair+0x1c98/0x2be0 kernel/sched/fair.c:6717 select_task_rq kernel/sched/core.c:2089 [inline] try_to_wake_up+0x3f5/0x1360 kernel/sched/core.c:2645 hrtimer_wakeup+0x43/0x60 kernel/time/hrtimer.c:1774 __run_hrtimer kernel/time/hrtimer.c:1520 [inline] __hrtimer_run_queues+0x6a9/0xfc0 kernel/time/hrtimer.c:1584 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1646 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1079 [inline] __sysvec_apic_timer_interrupt+0x142/0x5e0 arch/x86/kernel/apic/apic.c:1096 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] sysvec_apic_timer_interrupt+0xe0/0x120 arch/x86/kernel/apic/apic.c:1090 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:587 RIP: 0010:arch_local_irq_enable arch/x86/include/asm/paravirt.h:775 [inline] RIP: 0010:devkmsg_poll+0x172/0x250 kernel/printk/printk.c:870 Code: ff df 48 c1 e8 03 80 3c 10 00 0f 85 c4 00 00 00 48 83 3d 60 fe 57 08 00 0f 84 87 00 00 00 e8 25 2c 17 00 fb 66 0f 1f 44 00 00 19 2c 17 00 44 89 e0 5b 5d 41 5c 41 5d c3 e8 0a 2c 17 00 48 89 RSP: 0018:ffffc90004e17ad8 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 00000000000019e6 RCX: 0000000000000006 RDX: ffff888093bfc280 RSI: ffffffff815d03bb RDI: ffffffff815d0389 RBP: 0000000000002972 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000041 R13: 0000000000000000 R14: ffff888093b4fd30 R15: ffffffff815d0250 vfs_poll include/linux/poll.h:90 [inline] ep_item_poll+0x14a/0x3e0 fs/eventpoll.c:887 ep_send_events_proc+0x272/0xc50 fs/eventpoll.c:1744 ep_scan_ready_list+0x28f/0x880 fs/eventpoll.c:714 ep_send_events fs/eventpoll.c:1788 [inline] ep_poll fs/eventpoll.c:1944 [inline] do_epoll_wait+0xac4/0x1190 fs/eventpoll.c:2333 __do_sys_epoll_wait fs/eventpoll.c:2343 [inline] __se_sys_epoll_wait fs/eventpoll.c:2340 [inline] __x64_sys_epoll_wait+0x93/0xf0 fs/eventpoll.c:2340 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f8857bd72e3 Code: Bad RIP value. RSP: 002b:00007ffc81c84318 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8 RAX: ffffffffffffffda RBX: 000055e314ff31e0 RCX: 00007f8857bd72e3 RDX: 0000000000000013 RSI: 00007ffc81c84320 RDI: 0000000000000008 RBP: 00007ffc81c84510 R08: 0000000001c9c380 R09: 00007ffc81dab080 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc81c84320 R13: 0000000000000001 R14: 0000000000000000 R15: 0005aa97e2627f29