INFO: task syz-executor.3:10725 can't die for more than 143 seconds. task:syz-executor.3 state:D stack:26816 pid:10725 ppid: 8499 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4269 [inline] __schedule+0x890/0x2030 kernel/sched/core.c:5019 schedule+0xcf/0x270 kernel/sched/core.c:5098 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5157 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103 blkdev_put+0x30/0x520 fs/block_dev.c:1795 blkdev_close+0x8c/0xb0 fs/block_dev.c:1844 __fput+0x283/0x920 fs/file_table.c:280 task_work_run+0xdd/0x190 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x1f0/0x200 kernel/entry/common.c:199 syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:274 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45deb9 Code: Unable to access opcode bytes at RIP 0x45de8f. RSP: 002b:00007f40ea27fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 0000000000012f00 RCX: 000000000045deb9 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 000000000118bf58 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007fffcb2c237f R14: 00007f40ea2809c0 R15: 000000000118bf2c INFO: task syz-executor.3:10725 blocked for more than 143 seconds. Not tainted 5.10.0-rc4-next-20201120-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:26816 pid:10725 ppid: 8499 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4269 [inline] __schedule+0x890/0x2030 kernel/sched/core.c:5019 schedule+0xcf/0x270 kernel/sched/core.c:5098 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5157 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103 blkdev_put+0x30/0x520 fs/block_dev.c:1795 blkdev_close+0x8c/0xb0 fs/block_dev.c:1844 __fput+0x283/0x920 fs/file_table.c:280 task_work_run+0xdd/0x190 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x1f0/0x200 kernel/entry/common.c:199 syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:274 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45deb9 Code: Unable to access opcode bytes at RIP 0x45de8f. RSP: 002b:00007f40ea27fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 0000000000012f00 RCX: 000000000045deb9 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 000000000118bf58 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007fffcb2c237f R14: 00007f40ea2809c0 R15: 000000000118bf2c INFO: task syz-executor.3:10746 can't die for more than 143 seconds. task:syz-executor.3 state:D stack:28536 pid:10746 ppid: 8499 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4269 [inline] __schedule+0x890/0x2030 kernel/sched/core.c:5019 schedule+0xcf/0x270 kernel/sched/core.c:5098 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5157 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103 __blkdev_get+0x457/0x1870 fs/block_dev.c:1472 blkdev_get+0xd1/0x240 fs/block_dev.c:1627 blkdev_open+0x21d/0x2b0 fs/block_dev.c:1744 do_dentry_open+0x4b9/0x11b0 fs/open.c:817 do_open fs/namei.c:3252 [inline] path_openat+0x1b9a/0x2730 fs/namei.c:3369 do_filp_open+0x17e/0x3c0 fs/namei.c:3396 do_sys_openat2+0x16d/0x420 fs/open.c:1168 do_sys_open fs/open.c:1184 [inline] __do_sys_open fs/open.c:1192 [inline] __se_sys_open fs/open.c:1188 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1188 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4179b1 Code: Unable to access opcode bytes at RIP 0x417987. RSP: 002b:00007f40ea25e820 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00000000004179b1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007f40ea25e850 RBP: 000000000118c008 R08: 000000000000000f R09: 0000000000000000 R10: 00007f40ea25f9d0 R11: 0000000000000293 R12: 000000000118bfd4 R13: 00007fffcb2c237f R14: 00007f40ea25f9c0 R15: 000000000118bfd4 INFO: task syz-executor.3:10746 blocked for more than 144 seconds. Not tainted 5.10.0-rc4-next-20201120-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:28536 pid:10746 ppid: 8499 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4269 [inline] __schedule+0x890/0x2030 kernel/sched/core.c:5019 schedule+0xcf/0x270 kernel/sched/core.c:5098 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5157 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103 __blkdev_get+0x457/0x1870 fs/block_dev.c:1472 blkdev_get+0xd1/0x240 fs/block_dev.c:1627 blkdev_open+0x21d/0x2b0 fs/block_dev.c:1744 do_dentry_open+0x4b9/0x11b0 fs/open.c:817 do_open fs/namei.c:3252 [inline] path_openat+0x1b9a/0x2730 fs/namei.c:3369 do_filp_open+0x17e/0x3c0 fs/namei.c:3396 do_sys_openat2+0x16d/0x420 fs/open.c:1168 do_sys_open fs/open.c:1184 [inline] __do_sys_open fs/open.c:1192 [inline] __se_sys_open fs/open.c:1188 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1188 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4179b1 Code: Unable to access opcode bytes at RIP 0x417987. RSP: 002b:00007f40ea25e820 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00000000004179b1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007f40ea25e850 RBP: 000000000118c008 R08: 000000000000000f R09: 0000000000000000 R10: 00007f40ea25f9d0 R11: 0000000000000293 R12: 000000000118bfd4 R13: 00007fffcb2c237f R14: 00007f40ea25f9c0 R15: 000000000118bfd4 INFO: task systemd-udevd:10743 blocked for more than 144 seconds. Not tainted 5.10.0-rc4-next-20201120-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:systemd-udevd state:D stack:26488 pid:10743 ppid: 4901 flags:0x00004100 Call Trace: context_switch kernel/sched/core.c:4269 [inline] __schedule+0x890/0x2030 kernel/sched/core.c:5019 schedule+0xcf/0x270 kernel/sched/core.c:5098 io_schedule+0xb5/0x120 kernel/sched/core.c:6792 wait_on_page_bit_common+0x424/0xeb0 mm/filemap.c:1273 wait_on_page_bit mm/filemap.c:1334 [inline] wait_on_page_locked include/linux/pagemap.h:670 [inline] wait_on_page_read mm/filemap.c:3148 [inline] do_read_cache_page+0x957/0x1390 mm/filemap.c:3191 read_mapping_page include/linux/pagemap.h:496 [inline] read_part_sector+0xf6/0x5b0 block/partitions/core.c:780 adfspart_check_ICS+0x9d/0xc90 block/partitions/acorn.c:360 check_partition block/partitions/core.c:140 [inline] blk_add_partitions+0x456/0xe40 block/partitions/core.c:708 bdev_disk_changed+0x288/0x580 fs/block_dev.c:1410 __blkdev_get+0xee4/0x1870 fs/block_dev.c:1539 blkdev_get+0xd1/0x240 fs/block_dev.c:1627 blkdev_open+0x21d/0x2b0 fs/block_dev.c:1744 do_dentry_open+0x4b9/0x11b0 fs/open.c:817 do_open fs/namei.c:3252 [inline] path_openat+0x1b9a/0x2730 fs/namei.c:3369 do_filp_open+0x17e/0x3c0 fs/namei.c:3396 do_sys_openat2+0x16d/0x420 fs/open.c:1168 do_sys_open fs/open.c:1184 [inline] __do_sys_open fs/open.c:1192 [inline] __se_sys_open fs/open.c:1188 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1188 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fc97c554840 Code: Unable to access opcode bytes at RIP 0x7fc97c554816. RSP: 002b:00007ffe2612a0a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000055d3a57240c0 RCX: 00007fc97c554840 RDX: 000055d3a4a69fe3 RSI: 00000000000a0800 RDI: 000055d3a5714670 RBP: 00007ffe2612a220 R08: 000055d3a4a69670 R09: 0000000000000010 R10: 000055d3a4a69d0c R11: 0000000000000246 R12: 00007ffe2612a170 R13: 000055d3a5714690 R14: 0000000000000003 R15: 000000000000000e Showing all locks held in the system: 1 lock held by ksoftirqd/0/10: #0: ffff8880b9e34f98 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1318 [inline] #0: ffff8880b9e34f98 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x217/0x2030 kernel/sched/core.c:4936 1 lock held by khungtaskd/1657: #0: ffffffff8b339ca0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6252 1 lock held by in:imklog/8190: #0: ffff88801ddd2870 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:932 1 lock held by syz-executor.3/10725: #0: ffff88814801db80 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x30/0x520 fs/block_dev.c:1795 1 lock held by syz-executor.3/10746: #0: ffff88814801db80 (&bdev->bd_mutex){+.+.}-{3:3}, at: __blkdev_get+0x457/0x1870 fs/block_dev.c:1472 1 lock held by systemd-udevd/10743: #0: ffff88814801db80 (&bdev->bd_mutex){+.+.}-{3:3}, at: __blkdev_get+0x457/0x1870 fs/block_dev.c:1472 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1657 Comm: khungtaskd Not tainted 5.10.0-rc4-next-20201120-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 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:338 kthread+0x3af/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8191 Comm: rs:main Q:Reg Not tainted 5.10.0-rc4-next-20201120-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0x231/0x5c00 kernel/locking/lockdep.c:4764 Code: 7c 24 18 00 0f 85 b6 0c 00 00 48 8b 44 24 30 0f b7 4c 24 08 4e 8d 24 10 49 8d 44 24 20 66 81 e1 ff 1f 48 89 c2 48 89 44 24 28 <48> b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 14 02 84 d2 74 09 RSP: 0018:ffffc90003a7f368 EFLAGS: 00000002 RAX: ffff8880208a5940 RBX: 0000000000000000 RCX: 000000000000002c RDX: ffff8880208a5940 RSI: 1ffff11004114b23 RDI: ffff8880208a5918 RBP: ffff8880208a4f80 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000078 R11: 0000000000000000 R12: ffff8880208a5920 R13: 0000000000000000 R14: ffffffff8b339ca0 R15: 0000000000000002 FS: 00007f2cdbf30700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5526c73000 CR3: 000000002554d000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire kernel/locking/lockdep.c:5435 [inline] lock_acquire+0x2a3/0x8c0 kernel/locking/lockdep.c:5400 rcu_lock_acquire include/linux/rcupdate.h:255 [inline] rcu_read_lock include/linux/rcupdate.h:644 [inline] ext4_get_group_desc+0x11c/0x4e0 fs/ext4/balloc.c:284 __ext4_get_inode_loc+0x1b3/0x1130 fs/ext4/inode.c:4309 ext4_get_inode_loc+0xf3/0x1b0 fs/ext4/inode.c:4448 ext4_reserve_inode_write+0xc6/0x230 fs/ext4/inode.c:5731 __ext4_mark_inode_dirty+0x178/0x8a0 fs/ext4/inode.c:5898 ext4_dirty_inode+0xf3/0x130 fs/ext4/inode.c:5942 __mark_inode_dirty+0x888/0x1190 fs/fs-writeback.c:2260 mark_inode_dirty include/linux/fs.h:2182 [inline] generic_write_end+0x316/0x4f0 fs/buffer.c:2239 ext4_da_write_end+0x20f/0xb20 fs/ext4/inode.c:3102 generic_perform_write+0x2c0/0x4f0 mm/filemap.c:3507 ext4_buffered_write_iter+0x244/0x4d0 fs/ext4/file.c:270 ext4_file_write_iter+0x422/0x1400 fs/ext4/file.c:664 call_write_iter include/linux/fs.h:1902 [inline] new_sync_write+0x426/0x650 fs/read_write.c:518 vfs_write+0x791/0xa30 fs/read_write.c:605 ksys_write+0x12d/0x250 fs/read_write.c:658 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f2cde9741cd Code: c2 20 00 00 75 10 b8 01 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ae fc ff ff 48 89 04 24 b8 01 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 f7 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007f2cdbf2f590 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f2cd0029710 RCX: 00007f2cde9741cd RDX: 0000000000000451 RSI: 00007f2cd0029710 RDI: 0000000000000009 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f2cd0029490 R13: 00007f2cdbf2f5b0 R14: 000055d298a737c0 R15: 0000000000000451