INFO: task udevd:7968 blocked in I/O wait for more than 143 seconds. Tainted: G L syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:udevd state:D stack:23528 pid:7968 tgid:7968 ppid:5151 task_flags:0x400140 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5388 [inline] __schedule+0x1295/0x67a0 kernel/sched/core.c:7189 __schedule_loop kernel/sched/core.c:7268 [inline] schedule+0xdd/0x390 kernel/sched/core.c:7283 io_schedule+0x8a/0xf0 kernel/sched/core.c:8110 folio_wait_bit_common+0x414/0xa70 mm/filemap.c:1324 folio_put_wait_locked mm/filemap.c:1493 [inline] do_read_cache_folio+0x3bc/0x6b0 mm/filemap.c:4089 read_mapping_folio include/linux/pagemap.h:1017 [inline] read_part_sector+0xd1/0x370 block/partitions/core.c:724 adfspart_check_POWERTEC+0x8a/0x630 block/partitions/acorn.c:450 check_partition block/partitions/core.c:143 [inline] blk_add_partitions block/partitions/core.c:591 [inline] bdev_disk_changed+0x7a3/0x1250 block/partitions/core.c:695 blkdev_get_whole+0x187/0x290 block/bdev.c:756 bdev_open+0x2c7/0xe40 block/bdev.c:965 blkdev_open+0x34e/0x4f0 block/fops.c:697 do_dentry_open+0x6d8/0x1660 fs/open.c:947 vfs_open+0x82/0x3f0 fs/open.c:1079 do_open fs/namei.c:4699 [inline] path_openat+0x208c/0x31a0 fs/namei.c:4858 do_file_open+0x20e/0x430 fs/namei.c:4887 do_sys_openat2+0x10d/0x1e0 fs/open.c:1364 do_sys_open fs/open.c:1370 [inline] __do_sys_openat fs/open.c:1386 [inline] __se_sys_openat fs/open.c:1381 [inline] __x64_sys_openat+0x12d/0x210 fs/open.c:1381 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x10b/0x830 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5a7eea7407 RSP: 002b:00007ffd5457e960 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f5a7f585880 RCX: 00007f5a7eea7407 RDX: 00000000000a0800 RSI: 0000564a94e373d0 RDI: ffffffffffffff9c RBP: 0000564a94e2d910 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000564a94e41fa0 R13: 0000564a94e3b190 R14: 0000000000000000 R15: 0000564a94e41fa0 Showing all locks held in the system: 1 lock held by khungtaskd/41: #0: ffffffff8e7e5420 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] #0: ffffffff8e7e5420 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #0: ffffffff8e7e5420 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6775 3 locks held by kworker/u32:2/46: 4 locks held by kworker/u32:3/60: 3 locks held by kworker/u32:10/3531: 1 lock held by udevd/5151: #0: ffff888028b46a98 (&type->i_mutex_dir_key#3){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1044 [inline] #0: ffff888028b46a98 (&type->i_mutex_dir_key#3){++++}-{4:4}, at: lookup_slow+0x42/0x70 fs/namei.c:1931 2 locks held by getty/5545: #0: ffff888029ab90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc9000019b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x419/0x14f0 drivers/tty/n_tty.c:2211 1 lock held by sshd-session/5652: #0: ffff888013678e70 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1094 [inline] #0: ffff888013678e70 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_fault+0x83f/0x2e90 mm/filemap.c:3562 1 lock held by udevd/7968: #0: ffff8880280aa350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x41a/0xe40 block/bdev.c:953 1 lock held by udevd/10626: #0: ffff8880280ae350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x41a/0xe40 block/bdev.c:953 2 locks held by syz.5.6968/21971: ============================================= NMI backtrace for cpu 2 CPU: 2 UID: 0 PID: 41 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x1d7/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] __sys_info lib/sys_info.c:157 [inline] sys_info+0x141/0x190 lib/sys_info.c:165 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline] watchdog+0xcb1/0x1030 kernel/hung_task.c:561 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 2 to CPUs 0-1,3: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 21954 Comm: syz.0.6963 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:check_kcov_mode kernel/kcov.c:185 [inline] RIP: 0010:write_comp_data+0x3a/0x90 kernel/kcov.c:246 Code: 65 48 8b 3d 90 eb 02 12 a9 00 01 ff 00 74 1b f6 c4 01 74 07 a9 00 00 ff 00 74 05 e9 80 f6 83 09 8b 87 d4 16 00 00 85 c0 74 f1 <8b> 87 b0 16 00 00 83 f8 03 75 e6 48 8b 87 b8 16 00 00 8b bf b4 16 RSP: 0018:ffffc90003b0f4d8 EFLAGS: 00000246 RAX: 0000000000000001 RBX: 0000000000000036 RCX: ffffffff825d7772 RDX: 0000000000000036 RSI: 0000000000000125 RDI: ffff88804ad10000 RBP: 0000000000000125 R08: 0000000000000004 R09: 0000000000000125 R10: 0000000000000036 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff88805eb07000 R14: 0000000000000000 R15: ffff88805eb07010 FS: 0000000000000000(0000) GS:ffff888097171000(0000) knlGS:0000000000000000 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000f73c52f0 CR3: 000000000e596000 CR4: 0000000000352ef0 Call Trace: tlb_flush_rmap_batch+0x142/0x1e0 mm/mmu_gather.c:57 tlb_flush_rmaps+0xa9/0x100 mm/mmu_gather.c:91 zap_pte_range mm/memory.c:1962 [inline] zap_pmd_range mm/memory.c:2020 [inline] zap_pud_range mm/memory.c:2048 [inline] zap_p4d_range mm/memory.c:2069 [inline] __zap_vma_range+0x24a7/0x4a30 mm/memory.c:2109 unmap_vmas+0x299/0x5f0 mm/memory.c:2178 exit_mmap+0x1ef/0xa10 mm/mmap.c:1300 __mmput+0x12a/0x410 kernel/fork.c:1178 mmput+0x67/0x80 kernel/fork.c:1201 exit_mm kernel/exit.c:582 [inline] do_exit+0x8b2/0x2af0 kernel/exit.c:964 do_group_exit+0xd5/0x2a0 kernel/exit.c:1119 get_signal+0x20ff/0x2210 kernel/signal.c:3037 arch_do_signal_or_restart+0x91/0x7a0 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop+0x8b/0x4f0 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline] do_int80_emulation+0x58b/0x700 arch/x86/entry/syscall_32.c:175 asm_int80_emulation+0x1a/0x20 arch/x86/include/asm/idtentry.h:621 RIP: 0023:0xf71861ab Code: Unable to access opcode bytes at 0xf7186181. RSP: 002b:00000000f543d42c EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: fffffffffffffe00 RBX: 0000000000000004 RCX: 0000000080000200 RDX: 0000000000002000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 NMI backtrace for cpu 3 CPU: 3 UID: 0 PID: 0 Comm: swapper/3 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63 Code: 56 94 02 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d e3 bf 22 00 fb f4 7c 42 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 RSP: 0000:ffffc9000048fdf0 EFLAGS: 00000202 RAX: 000000000029fdcb RBX: ffff88801c3ca500 RCX: ffffffff8b88d0b5 RDX: 0000000000000000 RSI: ffffffff8df2060a RDI: ffffffff8c1c4300 RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed10056a67b5 R10: ffff88802b533dab R11: 0000000000000000 R12: 0000000000000003 R13: ffffed10038794a0 R14: 0000000000000003 R15: ffffffff90d81650 FS: 0000000000000000(0000) GS:ffff888097471000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000f71b7810 CR3: 0000000059d2f000 CR4: 0000000000352ef0 Call Trace: arch_safe_halt arch/x86/include/asm/paravirt.h:62 [inline] default_idle+0x9/0x10 arch/x86/kernel/process.c:767 default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:199 [inline] do_idle+0x464/0x590 kernel/sched/idle.c:352 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:451 start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312 common_startup_64+0x13e/0x148 NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 1127 Comm: scsi_eh_0 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:lookup_chain_cache kernel/locking/lockdep.c:3798 [inline] RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:3821 [inline] RIP: 0010:validate_chain kernel/locking/lockdep.c:3876 [inline] RIP: 0010:__lock_acquire+0x85f/0x2630 kernel/locking/lockdep.c:5237 Code: b7 c0 48 0f a3 05 21 e1 2d 14 0f 83 b2 09 00 00 49 bc eb 83 b5 80 46 86 c8 61 4d 0f af e7 49 c1 ec 2d 4a 8b 04 e5 20 4c 4f 97 <4e> 8d 34 e5 20 4c 4f 97 48 85 c0 74 1f 48 83 e8 08 48 85 c0 74 16 RSP: 0018:ffffc90006e97168 EFLAGS: 00000803 RAX: ffffffff941608a8 RBX: ffff888029670c08 RCX: 0000000000000003 RDX: 00000000214a2198 RSI: 0000000008972626 RDI: 00000000a5910211 RBP: ffff888029670000 R08: 000000009cf9dbeb R09: 000000000000000e R10: ffffffff8e6f1560 R11: 0000000000000000 R12: 0000000000062e9e R13: 000000000000000e R14: 0000000000000000 R15: 158bb98b214a2198 FS: 0000000000000000(0000) GS:ffff888097271000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000033115ff8 CR3: 0000000054c89000 CR4: 0000000000352ef0 Call Trace: lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1b1/0x370 kernel/locking/lockdep.c:5825 console_lock_spinning_enable+0x72/0x80 kernel/printk/printk.c:1902 console_emit_next_record kernel/printk/printk.c:3177 [inline] console_flush_one_record+0x739/0xe50 kernel/printk/printk.c:3269 console_flush_all kernel/printk/printk.c:3343 [inline] __console_flush_and_unlock kernel/printk/printk.c:3373 [inline] console_unlock+0x103/0x260 kernel/printk/printk.c:3413 vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479 _printk+0xcf/0x110 kernel/printk/printk.c:2504 ata_read_log_page.cold+0xae/0xc1 drivers/ata/libata-core.c:2163 ata_eh_read_log_10h drivers/ata/libata-sata.c:1488 [inline] ata_eh_analyze_ncq_error+0x2a2/0xde0 drivers/ata/libata-sata.c:1662 ata_eh_link_autopsy+0x274/0x3260 drivers/ata/libata-eh.c:2328 ata_eh_autopsy+0x37/0x3a0 drivers/ata/libata-eh.c:2445 sata_pmp_error_handler+0xa0/0x1380 drivers/ata/libata-pmp.c:1102 ahci_error_handler+0x10c/0x1f0 drivers/ata/libahci.c:2224 ata_scsi_port_error_handler+0xdc4/0x1a90 drivers/ata/libata-eh.c:768 ata_scsi_error+0x24b/0x3b0 drivers/ata/libata-eh.c:579 scsi_error_handler+0x2fb/0x1500 drivers/scsi/scsi_error.c:2395 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ---------------- Code disassembly (best guess): 0: 65 48 8b 3d 90 eb 02 mov %gs:0x1202eb90(%rip),%rdi # 0x1202eb98 7: 12 8: a9 00 01 ff 00 test $0xff0100,%eax d: 74 1b je 0x2a f: f6 c4 01 test $0x1,%ah 12: 74 07 je 0x1b 14: a9 00 00 ff 00 test $0xff0000,%eax 19: 74 05 je 0x20 1b: e9 80 f6 83 09 jmp 0x983f6a0 20: 8b 87 d4 16 00 00 mov 0x16d4(%rdi),%eax 26: 85 c0 test %eax,%eax 28: 74 f1 je 0x1b * 2a: 8b 87 b0 16 00 00 mov 0x16b0(%rdi),%eax <-- trapping instruction 30: 83 f8 03 cmp $0x3,%eax 33: 75 e6 jne 0x1b 35: 48 8b 87 b8 16 00 00 mov 0x16b8(%rdi),%rax 3c: 8b .byte 0x8b 3d: bf .byte 0xbf 3e: b4 16 mov $0x16,%ah