INFO: task systemd-udevd:11878 blocked for more than 143 seconds. Not tainted 5.8.0-rc2-next-20200626-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. systemd-udevd D26784 11878 3878 0x00004100 Call Trace: context_switch kernel/sched/core.c:3455 [inline] __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4180 schedule+0xd0/0x2a0 kernel/sched/core.c:4255 io_schedule+0xb5/0x120 kernel/sched/core.c:5946 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:2774 [inline] do_read_cache_page+0x957/0x1390 mm/filemap.c:2817 read_mapping_page include/linux/pagemap.h:437 [inline] read_part_sector+0xf6/0x5af block/partitions/core.c:772 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:700 bdev_disk_changed+0x1ea/0x370 fs/block_dev.c:1523 __blkdev_get+0x12ea/0x14d0 fs/block_dev.c:1661 blkdev_get+0x45/0x4d0 fs/block_dev.c:1727 blkdev_open+0x21d/0x2b0 fs/block_dev.c:1869 do_dentry_open+0x4b9/0x11b0 fs/open.c:822 do_open fs/namei.c:3249 [inline] path_openat+0x1bb9/0x2750 fs/namei.c:3366 do_filp_open+0x17e/0x3c0 fs/namei.c:3393 do_sys_openat2+0x16f/0x3b0 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:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f065f46a840 Code: Bad RIP value. RSP: 002b:00007ffd14932be8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00005601754c6740 RCX: 00007f065f46a840 RDX: 00005601734abfe3 RSI: 00000000000a0800 RDI: 00005601754b31d0 RBP: 00007ffd14932d60 R08: 00005601734ab670 R09: 0000000000000010 R10: 00005601734abd0c R11: 0000000000000246 R12: 00007ffd14932cb0 R13: 00005601754c6e20 R14: 0000000000000003 R15: 000000000000000e INFO: task syz-executor.1:11935 can't die for more than 143 seconds. syz-executor.1 D28528 11935 6948 0x00004004 Call Trace: context_switch kernel/sched/core.c:3455 [inline] __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4180 schedule+0xd0/0x2a0 kernel/sched/core.c:4255 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4314 __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:1920 blkdev_close+0x8c/0xb0 fs/block_dev.c:1969 __fput+0x33c/0x880 fs/file_table.c:281 task_work_run+0xdd/0x190 kernel/task_work.c:123 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop arch/x86/entry/common.c:216 [inline] __prepare_exit_to_usermode+0x1e9/0x1f0 arch/x86/entry/common.c:246 do_syscall_64+0x6c/0xe0 arch/x86/entry/common.c:368 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cb19 Code: Bad RIP value. RSP: 002b:00007f734632cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 00000000004e9b80 RCX: 000000000045cb19 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000416 R14: 00000000004c6e52 R15: 00007f734632d6d4 INFO: task syz-executor.1:11935 blocked for more than 143 seconds. Not tainted 5.8.0-rc2-next-20200626-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28528 11935 6948 0x00004004 Call Trace: context_switch kernel/sched/core.c:3455 [inline] __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4180 schedule+0xd0/0x2a0 kernel/sched/core.c:4255 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4314 __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:1920 blkdev_close+0x8c/0xb0 fs/block_dev.c:1969 __fput+0x33c/0x880 fs/file_table.c:281 task_work_run+0xdd/0x190 kernel/task_work.c:123 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop arch/x86/entry/common.c:216 [inline] __prepare_exit_to_usermode+0x1e9/0x1f0 arch/x86/entry/common.c:246 do_syscall_64+0x6c/0xe0 arch/x86/entry/common.c:368 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cb19 Code: Bad RIP value. RSP: 002b:00007f734632cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 00000000004e9b80 RCX: 000000000045cb19 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000416 R14: 00000000004c6e52 R15: 00007f734632d6d4 INFO: task syz-executor.1:11941 can't die for more than 144 seconds. syz-executor.1 D28736 11941 6948 0x00000004 Call Trace: context_switch kernel/sched/core.c:3455 [inline] __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4180 schedule+0xd0/0x2a0 kernel/sched/core.c:4255 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4314 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 __blkdev_get+0x167/0x14d0 fs/block_dev.c:1578 blkdev_get+0x45/0x4d0 fs/block_dev.c:1727 blkdev_open+0x21d/0x2b0 fs/block_dev.c:1869 do_dentry_open+0x4b9/0x11b0 fs/open.c:822 do_open fs/namei.c:3249 [inline] path_openat+0x1bb9/0x2750 fs/namei.c:3366 do_filp_open+0x17e/0x3c0 fs/namei.c:3393 do_sys_openat2+0x16f/0x3b0 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:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x416911 Code: Bad RIP value. RSP: 002b:00007f734630b7a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000416911 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007f734630b850 RBP: 000000000078bfa0 R08: 000000000000000f R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00000000ffffffff R13: 0000000000000c4e R14: 00000000004cea60 R15: 00007f734630c6d4 INFO: task syz-executor.1:11941 blocked for more than 144 seconds. Not tainted 5.8.0-rc2-next-20200626-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28736 11941 6948 0x00000004 Call Trace: context_switch kernel/sched/core.c:3455 [inline] __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4180 schedule+0xd0/0x2a0 kernel/sched/core.c:4255 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4314 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 __blkdev_get+0x167/0x14d0 fs/block_dev.c:1578 blkdev_get+0x45/0x4d0 fs/block_dev.c:1727 blkdev_open+0x21d/0x2b0 fs/block_dev.c:1869 do_dentry_open+0x4b9/0x11b0 fs/open.c:822 do_open fs/namei.c:3249 [inline] path_openat+0x1bb9/0x2750 fs/namei.c:3366 do_filp_open+0x17e/0x3c0 fs/namei.c:3393 do_sys_openat2+0x16f/0x3b0 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:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x416911 Code: Bad RIP value. RSP: 002b:00007f734630b7a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000416911 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007f734630b850 RBP: 000000000078bfa0 R08: 000000000000000f R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00000000ffffffff R13: 0000000000000c4e R14: 00000000004cea60 R15: 00007f734630c6d4 Showing all locks held in the system: 1 lock held by khungtaskd/1153: #0: ffffffff89bc3180 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5779 2 locks held by in:imklog/6498: #0: ffff8880a03b85f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:928 #1: ffffffff89bc3180 (rcu_read_lock){....}-{1:2}, at: syslog_print kernel/printk/printk.c:1392 [inline] #1: ffffffff89bc3180 (rcu_read_lock){....}-{1:2}, at: do_syslog.part.0+0x2d3/0x16c0 kernel/printk/printk.c:1557 2 locks held by agetty/6630: #0: ffff8880a2fe3098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc90000f542e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x223/0x1a30 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.0/10498: #0: ffffffff8a028c30 (key_types_sem){++++}-{3:3}, at: key_type_lookup+0x1a/0xf0 security/keys/key.c:704 1 lock held by syz-executor.4/18066: #0: ffffffff8a028c30 (key_types_sem){++++}-{3:3}, at: key_type_lookup+0x1a/0xf0 security/keys/key.c:704 1 lock held by syz-executor.3/10646: #0: ffffffff8a028c30 (key_types_sem){++++}-{3:3}, at: key_type_lookup+0x1a/0xf0 security/keys/key.c:704 1 lock held by systemd-udevd/11878: #0: ffff88808aac7300 (&bdev->bd_mutex){+.+.}-{3:3}, at: __blkdev_get+0x167/0x14d0 fs/block_dev.c:1578 1 lock held by syz-executor.1/11935: #0: ffff88808aac7300 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x30/0x520 fs/block_dev.c:1920 1 lock held by syz-executor.1/11941: #0: ffff88808aac7300 (&bdev->bd_mutex){+.+.}-{3:3}, at: __blkdev_get+0x167/0x14d0 fs/block_dev.c:1578 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1153 Comm: khungtaskd Not tainted 5.8.0-rc2-next-20200626-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+0x70/0xb1 lib/nmi_backtrace.c:101 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 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60