INFO: task systemd-udevd:26208 blocked for more than 143 seconds. Not tainted 5.14.0-rc5-next-20210816-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:systemd-udevd state:D stack:26760 pid:26208 ppid: 2985 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4711 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5966 schedule+0xd3/0x270 kernel/sched/core.c:6045 io_schedule+0xba/0x130 kernel/sched/core.c:8035 folio_wait_bit_common+0x4f2/0xa60 mm/filemap.c:1365 folio_wait_bit mm/filemap.c:1425 [inline] folio_wait_locked include/linux/pagemap.h:802 [inline] folio_wait_locked include/linux/pagemap.h:799 [inline] wait_on_page_locked include/linux/pagemap.h:814 [inline] wait_on_page_read mm/filemap.c:3429 [inline] do_read_cache_page+0x988/0x11a0 mm/filemap.c:3472 read_mapping_page include/linux/pagemap.h:602 [inline] read_part_sector+0xfa/0x5c0 block/partitions/core.c:727 adfspart_check_ICS+0x9d/0xc90 block/partitions/acorn.c:360 check_partition block/partitions/core.c:147 [inline] blk_add_partitions block/partitions/core.c:612 [inline] bdev_disk_changed+0x7bc/0x1140 block/partitions/core.c:698 blkdev_get_whole+0x206/0x2a0 fs/block_dev.c:1086 blkdev_get_by_dev.part.0+0x354/0xb60 fs/block_dev.c:1228 blkdev_get_by_dev fs/block_dev.c:1317 [inline] blkdev_open+0x295/0x300 fs/block_dev.c:1323 do_dentry_open+0x4c8/0x11d0 fs/open.c:826 do_open fs/namei.c:3428 [inline] path_openat+0x1c9a/0x2880 fs/namei.c:3561 do_filp_open+0x1aa/0x400 fs/namei.c:3588 do_sys_openat2+0x16d/0x4d0 fs/open.c:1204 do_sys_open fs/open.c:1220 [inline] __do_sys_open fs/open.c:1228 [inline] __se_sys_open fs/open.c:1224 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1224 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f3676231840 RSP: 002b:00007ffeb4e05228 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000055849e10cfa0 RCX: 00007f3676231840 RDX: 000055849c9aefe3 RSI: 00000000000a0800 RDI: 000055849e10d100 RBP: 00007ffeb4e053a0 R08: 000055849c9ae670 R09: 0000000000000010 R10: 000055849c9aed0c R11: 0000000000000246 R12: 00007ffeb4e052f0 R13: 000055849e10c820 R14: 0000000000000003 R15: 000000000000000e INFO: task systemd-udevd:26512 blocked for more than 143 seconds. Not tainted 5.14.0-rc5-next-20210816-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:systemd-udevd state:D stack:27192 pid:26512 ppid: 2985 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4711 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5966 schedule+0xd3/0x270 kernel/sched/core.c:6045 io_schedule+0xba/0x130 kernel/sched/core.c:8035 folio_wait_bit_common+0x4f2/0xa60 mm/filemap.c:1365 folio_wait_bit mm/filemap.c:1425 [inline] folio_wait_locked include/linux/pagemap.h:802 [inline] folio_wait_locked include/linux/pagemap.h:799 [inline] wait_on_page_locked include/linux/pagemap.h:814 [inline] wait_on_page_read mm/filemap.c:3429 [inline] do_read_cache_page+0x988/0x11a0 mm/filemap.c:3472 read_mapping_page include/linux/pagemap.h:602 [inline] read_part_sector+0xfa/0x5c0 block/partitions/core.c:727 adfspart_check_ICS+0x9d/0xc90 block/partitions/acorn.c:360 check_partition block/partitions/core.c:147 [inline] blk_add_partitions block/partitions/core.c:612 [inline] bdev_disk_changed+0x7bc/0x1140 block/partitions/core.c:698 blkdev_get_whole+0x206/0x2a0 fs/block_dev.c:1086 blkdev_get_by_dev.part.0+0x354/0xb60 fs/block_dev.c:1228 blkdev_get_by_dev fs/block_dev.c:1317 [inline] blkdev_open+0x295/0x300 fs/block_dev.c:1323 do_dentry_open+0x4c8/0x11d0 fs/open.c:826 do_open fs/namei.c:3428 [inline] path_openat+0x1c9a/0x2880 fs/namei.c:3561 do_filp_open+0x1aa/0x400 fs/namei.c:3588 do_sys_openat2+0x16d/0x4d0 fs/open.c:1204 do_sys_open fs/open.c:1220 [inline] __do_sys_open fs/open.c:1228 [inline] __se_sys_open fs/open.c:1224 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1224 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f3676231840 RSP: 002b:00007ffeb4e05228 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000055849e10da20 RCX: 00007f3676231840 RDX: 000055849c9aefe3 RSI: 00000000000a0800 RDI: 000055849e0f9a00 RBP: 00007ffeb4e053a0 R08: 000055849c9ae670 R09: 0000000000000010 R10: 000055849c9aed0c R11: 0000000000000246 R12: 00007ffeb4e052f0 R13: 000055849e1096f0 R14: 0000000000000003 R15: 000000000000000e INFO: task syz-executor.3:26530 can't die for more than 144 seconds. task:syz-executor.3 state:D stack:28808 pid:26530 ppid: 17771 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4711 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5966 schedule+0xd3/0x270 kernel/sched/core.c:6045 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6104 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0xa46/0x1300 kernel/locking/mutex.c:1096 blkdev_put+0x97/0x9e0 fs/block_dev.c:1345 blkdev_close+0x8c/0xb0 fs/block_dev.c:1397 __fput+0x288/0x9f0 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4193fb RSP: 002b:00007ffd37071150 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00000000004193fb RDX: 0000000000000000 RSI: 00007f8cbc7dc3b0 RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b32228590 R10: 00000000000002a3 R11: 0000000000000293 R12: 000000000056cb00 R13: 000000000056cb00 R14: 000000000056bf80 R15: 000000000008084b INFO: task syz-executor.3:26530 blocked for more than 144 seconds. Not tainted 5.14.0-rc5-next-20210816-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:28808 pid:26530 ppid: 17771 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4711 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5966 schedule+0xd3/0x270 kernel/sched/core.c:6045 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6104 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0xa46/0x1300 kernel/locking/mutex.c:1096 blkdev_put+0x97/0x9e0 fs/block_dev.c:1345 blkdev_close+0x8c/0xb0 fs/block_dev.c:1397 __fput+0x288/0x9f0 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4193fb RSP: 002b:00007ffd37071150 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00000000004193fb RDX: 0000000000000000 RSI: 00007f8cbc7dc3b0 RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b32228590 R10: 00000000000002a3 R11: 0000000000000293 R12: 000000000056cb00 R13: 000000000056cb00 R14: 000000000056bf80 R15: 000000000008084b INFO: task syz-executor.4:26533 can't die for more than 144 seconds. task:syz-executor.4 state:D stack:28808 pid:26533 ppid: 19968 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4711 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5966 schedule+0xd3/0x270 kernel/sched/core.c:6045 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6104 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0xa46/0x1300 kernel/locking/mutex.c:1096 blkdev_put+0x97/0x9e0 fs/block_dev.c:1345 blkdev_close+0x8c/0xb0 fs/block_dev.c:1397 __fput+0x288/0x9f0 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4193fb RSP: 002b:00007ffcc29f2ed0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00000000004193fb RDX: 0000000000000000 RSI: 00007f10254f2eb0 RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b333284a4 R10: 00000000000002a3 R11: 0000000000000293 R12: 000000000056cb00 R13: 000000000056cb00 R14: 000000000056bf80 R15: 0000000000080858 INFO: task syz-executor.4:26533 blocked for more than 144 seconds. Not tainted 5.14.0-rc5-next-20210816-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:28808 pid:26533 ppid: 19968 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4711 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5966 schedule+0xd3/0x270 kernel/sched/core.c:6045 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6104 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0xa46/0x1300 kernel/locking/mutex.c:1096 blkdev_put+0x97/0x9e0 fs/block_dev.c:1345 blkdev_close+0x8c/0xb0 fs/block_dev.c:1397 __fput+0x288/0x9f0 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4193fb RSP: 002b:00007ffcc29f2ed0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00000000004193fb RDX: 0000000000000000 RSI: 00007f10254f2eb0 RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b333284a4 R10: 00000000000002a3 R11: 0000000000000293 R12: 000000000056cb00 R13: 000000000056cb00 R14: 000000000056bf80 R15: 0000000000080858 INFO: lockdep is turned off. NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.14.0-rc5-next-20210816-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:254 [inline] watchdog+0xcb7/0xed0 kernel/hung_task.c:339 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 6475 Comm: in:imklog Not tainted 5.14.0-rc5-next-20210816-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:desc_read+0x1b/0x350 kernel/printk/printk_ringbuffer.c:435 Code: 5d 00 e9 3c fe ff ff e8 03 66 d2 07 0f 1f 00 41 57 41 56 49 89 f6 41 55 41 54 55 48 89 d5 53 48 89 fb 48 83 ec 18 48 89 0c 24 <4c> 89 44 24 08 e8 bb 31 18 00 48 89 da 48 b8 00 00 00 00 00 fc ff RSP: 0018:ffffc9000c29f828 EFLAGS: 00000296 RAX: 0000000000000000 RBX: ffffffff8b88dec0 RCX: ffffc9000c29f898 RDX: ffffc9000c29f9e0 RSI: 00000000fffff8e4 RDI: ffffffff8b88dec0 RBP: ffffc9000c29f9e0 R08: 0000000000000000 R09: ffff88804b3a001b R10: ffffed1009674003 R11: 0000000000000000 R12: 1ffff92001853f0f R13: 00000000000018e4 R14: 00000000fffff8e4 R15: dffffc0000000000 FS: 00007f6582456700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fdaf1a69028 CR3: 000000006fab3000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: desc_read_finalized_seq+0x81/0x1c0 kernel/printk/printk_ringbuffer.c:1752 prb_read kernel/printk/printk_ringbuffer.c:1820 [inline] _prb_read_valid+0x4ab/0x710 kernel/printk/printk_ringbuffer.c:1880 prb_read_valid+0x75/0xa0 kernel/printk/printk_ringbuffer.c:1929 syslog_print+0x3f2/0x580 kernel/printk/printk.c:1522 do_syslog.part.0+0x202/0x640 kernel/printk/printk.c:1658 do_syslog+0x49/0x60 kernel/printk/printk.c:1643 kmsg_read+0x90/0xb0 fs/proc/kmsg.c:40 pde_read fs/proc/inode.c:311 [inline] proc_reg_read+0x119/0x300 fs/proc/inode.c:321 vfs_read+0x1b5/0x600 fs/read_write.c:494 ksys_read+0x12d/0x250 fs/read_write.c:634 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f6584a9922d Code: c1 20 00 00 75 10 b8 00 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 4e fc ff ff 48 89 04 24 b8 00 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 97 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007f6582435580 EFLAGS: 00000293 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f6584a9922d RDX: 0000000000001fa0 RSI: 00007f6582435da0 RDI: 0000000000000004 RBP: 0000560b8a7309d0 R08: 0000000000000000 R09: 0000000004000001 R10: 0000000000000001 R11: 0000000000000293 R12: 00007f6582435da0 R13: 0000000000001fa0 R14: 0000000000001f9f R15: 00007f6582435dfc ---------------- Code disassembly (best guess), 2 bytes skipped: 0: e9 3c fe ff ff jmpq 0xfffffe41 5: e8 03 66 d2 07 callq 0x7d2660d a: 0f 1f 00 nopl (%rax) d: 41 57 push %r15 f: 41 56 push %r14 11: 49 89 f6 mov %rsi,%r14 14: 41 55 push %r13 16: 41 54 push %r12 18: 55 push %rbp 19: 48 89 d5 mov %rdx,%rbp 1c: 53 push %rbx 1d: 48 89 fb mov %rdi,%rbx 20: 48 83 ec 18 sub $0x18,%rsp 24: 48 89 0c 24 mov %rcx,(%rsp) 28: 4c 89 44 24 08 mov %r8,0x8(%rsp) <-- trapping instruction 2d: e8 bb 31 18 00 callq 0x1831ed 32: 48 89 da mov %rbx,%rdx 35: 48 rex.W 36: b8 00 00 00 00 mov $0x0,%eax 3b: 00 fc add %bh,%ah 3d: ff .byte 0xff