INFO: task systemd-udevd:23746 blocked for more than 143 seconds. Not tainted 5.14.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:systemd-udevd state:D stack:23600 pid:23746 ppid: 4866 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4681 [inline] __schedule+0xc07/0x11f0 kernel/sched/core.c:5938 schedule+0x14b/0x210 kernel/sched/core.c:6017 io_schedule+0x83/0x100 kernel/sched/core.c:7988 wait_on_page_bit_common+0x9ca/0x1030 mm/filemap.c:1301 wait_on_page_bit mm/filemap.c:1362 [inline] wait_on_page_locked include/linux/pagemap.h:689 [inline] wait_on_page_read+0x19d/0x430 mm/filemap.c:3312 do_read_cache_page+0xb1b/0xe10 mm/filemap.c:3355 read_mapping_page include/linux/pagemap.h:515 [inline] read_part_sector+0x118/0x500 block/partitions/core.c:726 adfspart_check_ICS+0x9e/0xa40 block/partitions/acorn.c:360 check_partition block/partitions/core.c:147 [inline] blk_add_partitions block/partitions/core.c:611 [inline] bdev_disk_changed+0x764/0x1690 block/partitions/core.c:697 blkdev_get_whole+0x42c/0x500 fs/block_dev.c:1269 blkdev_get_by_dev+0x339/0xdc0 fs/block_dev.c:1417 blkdev_open+0x132/0x2c0 fs/block_dev.c:1512 do_dentry_open+0x7cb/0x1020 fs/open.c:826 do_open fs/namei.c:3374 [inline] path_openat+0x27e7/0x36b0 fs/namei.c:3507 do_filp_open+0x253/0x4d0 fs/namei.c:3534 do_sys_openat2+0x124/0x460 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+0x221/0x270 fs/open.c:1224 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fa6fcfbd840 RSP: 002b:00007ffc28e26f48 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000556061594a00 RCX: 00007fa6fcfbd840 RDX: 00005560611dafe3 RSI: 00000000000a0800 RDI: 000055606157ffb0 RBP: 00007ffc28e270c0 R08: 00005560611da670 R09: 0000000000000010 R10: 00005560611dad0c R11: 0000000000000246 R12: 00007ffc28e27010 R13: 0000556061593030 R14: 0000000000000003 R15: 000000000000000e INFO: task syz-executor.4:16803 blocked for more than 143 seconds. Not tainted 5.14.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:26416 pid:16803 ppid: 8464 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4681 [inline] __schedule+0xc07/0x11f0 kernel/sched/core.c:5938 schedule+0x14b/0x210 kernel/sched/core.c:6017 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6076 __mutex_lock_common+0x116f/0x3770 kernel/locking/mutex.c:1036 __mutex_lock kernel/locking/mutex.c:1104 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:1119 blkdev_put+0xfc/0x810 fs/block_dev.c:1534 blkdev_close+0x7a/0xa0 fs/block_dev.c:1586 __fput+0x352/0x7b0 fs/file_table.c:280 task_work_run+0x146/0x1c0 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+0x201/0x220 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x26/0x60 kernel/entry/common.c:302 do_syscall_64+0x4c/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4193fb RSP: 002b:00007ffef6e05490 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00000000004193fb RDX: 0000001b33b259c0 RSI: 00007fbdec984630 RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b33b239c0 R10: 0000000000001020 R11: 0000000000000293 R12: 000000000056cb00 R13: 000000000056cb00 R14: 000000000056bf80 R15: 00000000001204b6 Showing all locks held in the system: 3 locks held by kworker/u4:2/49: #0: ffff8880b9d51558 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x1b/0x30 kernel/sched/core.c:460 #1: ffff8880b9d1f888 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x50b/0x820 kernel/sched/psi.c:880 #2: ffffffff8c717ec0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:266 1 lock held by khungtaskd/1646: #0: ffffffff8c717ec0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 1 lock held by in:imklog/8139: #0: ffff88802ab46370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:974 1 lock held by systemd-udevd/23746: #0: ffff88801f782518 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x102/0xdc0 fs/block_dev.c:1410 1 lock held by syz-executor.4/16803: #0: ffff88801f782518 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xfc/0x810 fs/block_dev.c:1534 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1646 Comm: khungtaskd Not tainted 5.14.0-rc6-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+0x1d3/0x29f lib/dump_stack.c:105 nmi_cpu_backtrace+0x16c/0x190 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x191/0x2f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xd06/0xd50 kernel/hung_task.c:295 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4852 Comm: systemd-journal Not tainted 5.14.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:current_gfp_context include/linux/sched/mm.h:158 [inline] RIP: 0010:fs_reclaim_release+0x25/0xa0 mm/page_alloc.c:4582 Code: 0f 1f 44 00 00 55 53 89 fd 65 48 8b 1c 25 c0 ef 01 00 48 83 c3 2c 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 8a 04 08 <84> c0 75 58 8b 03 a9 00 00 0c 10 75 1f 81 e5 80 04 00 02 81 fd 80 RSP: 0018:ffffc900015ffd00 EFLAGS: 00000a07 RAX: 1ffff11002abe300 RBX: ffff8880155f1c6c RCX: dffffc0000000000 RDX: 1ffff920002bff8c RSI: 0000000000000000 RDI: 0000000000400dc0 RBP: 0000000000400dc0 R08: dffffc0000000000 R09: fffffbfff1b74dd6 R10: fffffbfff1b74dd6 R11: 0000000000000000 R12: ffff888013994500 R13: ffffffff83c9a13d R14: 00000000000000c8 R15: 0000000000400dc0 FS: 00007f651b8408c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6519132000 CR3: 000000001ed4e000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: might_alloc include/linux/sched/mm.h:199 [inline] slab_pre_alloc_hook mm/slab.h:492 [inline] slab_alloc_node mm/slub.c:2880 [inline] slab_alloc mm/slub.c:2967 [inline] __kmalloc+0x5f/0x390 mm/slub.c:4111 kmalloc include/linux/slab.h:596 [inline] kzalloc+0x1d/0x30 include/linux/slab.h:721 lsm_cred_alloc security/security.c:537 [inline] security_prepare_creds+0x46/0x220 security/security.c:1691 prepare_creds+0x411/0x640 kernel/cred.c:289 access_override_creds fs/open.c:355 [inline] do_faccessat+0xd2/0x910 fs/open.c:419 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f651aafb9c7 Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffd67be07a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007ffd67be37d0 RCX: 00007f651aafb9c7 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000556f663349a3 RBP: 00007ffd67be08f0 R08: 0000556f6632a3e5 R09: 0000000000000018 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000556f674b78a0 R15: 00007ffd67be0de0 ---------------- Code disassembly (best guess): 0: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 5: 55 push %rbp 6: 53 push %rbx 7: 89 fd mov %edi,%ebp 9: 65 48 8b 1c 25 c0 ef mov %gs:0x1efc0,%rbx 10: 01 00 12: 48 83 c3 2c add $0x2c,%rbx 16: 48 89 d8 mov %rbx,%rax 19: 48 c1 e8 03 shr $0x3,%rax 1d: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 24: fc ff df 27: 8a 04 08 mov (%rax,%rcx,1),%al 2a: 84 c0 test %al,%al <-- trapping instruction 2c: 75 58 jne 0x86 2e: 8b 03 mov (%rbx),%eax 30: a9 00 00 0c 10 test $0x100c0000,%eax 35: 75 1f jne 0x56 37: 81 e5 80 04 00 02 and $0x2000480,%ebp 3d: 81 .byte 0x81 3e: fd std 3f: 80 .byte 0x80