INFO: task syz-executor.4:10024 blocked for more than 143 seconds. Not tainted 5.8.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28624 10024 6995 0x00004004 Call Trace: context_switch kernel/sched/core.c:3453 [inline] __schedule+0x7d3/0xc40 kernel/sched/core.c:4178 INFO: task syz-executor.5:10032 blocked for more than 143 seconds. Not tainted 5.8.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28624 10032 6997 0x00004004 Call Trace: context_switch kernel/sched/core.c:3453 [inline] __schedule+0x7d3/0xc40 kernel/sched/core.c:4178 INFO: task syz-executor.0:10042 blocked for more than 143 seconds. Not tainted 5.8.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28576 10042 7001 0x00004004 Call Trace: context_switch kernel/sched/core.c:3453 [inline] __schedule+0x7d3/0xc40 kernel/sched/core.c:4178 INFO: task syz-executor.2:10047 blocked for more than 143 seconds. Not tainted 5.8.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28576 10047 6992 0x00004004 Call Trace: context_switch kernel/sched/core.c:3453 [inline] __schedule+0x7d3/0xc40 kernel/sched/core.c:4178 INFO: task syz-executor.2:10053 blocked for more than 143 seconds. Not tainted 5.8.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28624 10053 6992 0x00004004 Call Trace: context_switch kernel/sched/core.c:3453 [inline] __schedule+0x7d3/0xc40 kernel/sched/core.c:4178 INFO: task syz-executor.2:10072 blocked for more than 143 seconds. Not tainted 5.8.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28624 10072 6992 0x00004004 Call Trace: context_switch kernel/sched/core.c:3453 [inline] __schedule+0x7d3/0xc40 kernel/sched/core.c:4178 INFO: task syz-executor.1:10057 blocked for more than 144 seconds. Not tainted 5.8.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28576 10057 7000 0x00004004 Call Trace: context_switch kernel/sched/core.c:3453 [inline] __schedule+0x7d3/0xc40 kernel/sched/core.c:4178 INFO: task syz-executor.1:10060 blocked for more than 144 seconds. Not tainted 5.8.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28576 10060 7000 0x00004004 Call Trace: context_switch kernel/sched/core.c:3453 [inline] __schedule+0x7d3/0xc40 kernel/sched/core.c:4178 INFO: task syz-executor.1:10074 blocked for more than 144 seconds. Not tainted 5.8.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28624 10074 7000 0x00004004 Call Trace: context_switch kernel/sched/core.c:3453 [inline] __schedule+0x7d3/0xc40 kernel/sched/core.c:4178 INFO: task syz-executor.3:10067 blocked for more than 144 seconds. Not tainted 5.8.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D27888 10067 7002 0x00004004 Call Trace: context_switch kernel/sched/core.c:3453 [inline] __schedule+0x7d3/0xc40 kernel/sched/core.c:4178 Showing all locks held in the system: 1 lock held by khungtaskd/1152: #0: ffffffff894e9490 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 1 lock held by in:imklog/6590: #0: ffff888093a32670 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x253/0x2f0 fs/file.c:826 1 lock held by syz-executor.4/10024: #0: ffffffff896d8528 (ubi_devices_mutex){+.+.}-{3:3}, at: ctrl_cdev_ioctl+0x16c/0x300 drivers/mtd/ubi/cdev.c:1067 1 lock held by syz-executor.5/10032: #0: ffffffff896d8528 (ubi_devices_mutex){+.+.}-{3:3}, at: ctrl_cdev_ioctl+0x16c/0x300 drivers/mtd/ubi/cdev.c:1067 1 lock held by syz-executor.0/10042: #0: ffffffff896d8528 (ubi_devices_mutex){+.+.}-{3:3}, at: ctrl_cdev_ioctl+0x16c/0x300 drivers/mtd/ubi/cdev.c:1067 1 lock held by syz-executor.2/10047: #0: ffffffff896d8528 (ubi_devices_mutex){+.+.}-{3:3}, at: ctrl_cdev_ioctl+0x16c/0x300 drivers/mtd/ubi/cdev.c:1067 1 lock held by syz-executor.2/10053: #0: ffffffff896d8528 (ubi_devices_mutex){+.+.}-{3:3}, at: ctrl_cdev_ioctl+0x1b4/0x300 drivers/mtd/ubi/cdev.c:1042 1 lock held by syz-executor.2/10072: #0: ffffffff896d8528 (ubi_devices_mutex){+.+.}-{3:3}, at: ctrl_cdev_ioctl+0x16c/0x300 drivers/mtd/ubi/cdev.c:1067 1 lock held by syz-executor.1/10057: #0: ffffffff896d8528 (ubi_devices_mutex){+.+.}-{3:3}, at: ctrl_cdev_ioctl+0x16c/0x300 drivers/mtd/ubi/cdev.c:1067 1 lock held by syz-executor.1/10060: #0: ffffffff896d8528 (ubi_devices_mutex){+.+.}-{3:3}, at: ctrl_cdev_ioctl+0x1b4/0x300 drivers/mtd/ubi/cdev.c:1042 1 lock held by syz-executor.1/10074: #0: ffffffff896d8528 (ubi_devices_mutex){+.+.}-{3:3}, at: ctrl_cdev_ioctl+0x16c/0x300 drivers/mtd/ubi/cdev.c:1067 1 lock held by syz-executor.3/10067: #0: ffffffff896d8528 (ubi_devices_mutex){+.+.}-{3:3}, at: ctrl_cdev_ioctl+0x16c/0x300 drivers/mtd/ubi/cdev.c:1067 1 lock held by syz-executor.3/10068: #0: ffffffff896d8528 (ubi_devices_mutex){+.+.}-{3:3}, at: ctrl_cdev_ioctl+0x1b4/0x300 drivers/mtd/ubi/cdev.c:1042 1 lock held by syz-executor.3/10076: #0: ffffffff896d8528 (ubi_devices_mutex){+.+.}-{3:3}, at: ctrl_cdev_ioctl+0x16c/0x300 drivers/mtd/ubi/cdev.c:1067 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1152 Comm: khungtaskd Not tainted 5.8.0-rc5-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+0x1f0/0x31e lib/dump_stack.c:118 nmi_cpu_backtrace+0x9f/0x180 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xd65/0xdb0 kernel/hung_task.c:295 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4056 Comm: systemd-journal Not tainted 5.8.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:format_decode+0x627/0x1ce0 lib/vsprintf.c:2398 Code: 24 10 8a 04 10 84 c0 0f 85 63 0d 00 00 48 8b 44 24 18 8a 04 10 84 c0 0f 85 81 0d 00 00 48 8b 5c 24 08 48 89 2b 48 8b 44 24 10 <8a> 04 10 84 c0 0f 85 cb 0c 00 00 48 8b 44 24 18 8a 04 10 84 c0 0f RSP: 0018:ffffc90001657b90 EFLAGS: 00000093 RAX: 1ffff920002caf8b RBX: ffffc90001657c58 RCX: ffff888092b84000 RDX: dffffc0000000000 RSI: 0000000000000075 RDI: 000000000000002a RBP: 0000000000000075 R08: ffffffff83bce46f R09: ffffffff83bce263 R10: 0000000000000005 R11: ffff888092b84000 R12: 1ffff920002caf79 R13: ffffffff8908d6b6 R14: ffffffff8908d6b5 R15: ffff0a00ffffff00 FS: 00007f80675878c0(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f80649d5000 CR3: 0000000092dd6000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: vsnprintf+0x10b/0x1aa0 lib/vsprintf.c:2572 snprintf+0x6f/0x90 lib/vsprintf.c:2753 msg_print_ext_header kernel/printk/printk.c:734 [inline] devkmsg_read+0x5c0/0xad0 kernel/printk/printk.c:921 vfs_read+0x243/0xab0 fs/read_write.c:479 ksys_read+0x11b/0x220 fs/read_write.c:607 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f8066b17210 Code: Bad RIP value. RSP: 002b:00007fff9136b418 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007fff9136de90 RCX: 00007f8066b17210 RDX: 0000000000002000 RSI: 00007fff9136bc90 RDI: 0000000000000009 RBP: 0000000000000000 R08: 0000000000000008 R09: 0000556e0c1e57b8 R10: 0000556e0c1e5780 R11: 0000000000000246 R12: 00007fff9136bc90 R13: 00007fff9136dde8 R14: 0000556e0b408958 R15: 0005aa7cdcf20b59