kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2cb5db26d4 R13: 00000000004c11db R14: 00000000004d5000 R15: 0000000000000005 ====================================================== WARNING: possible circular locking dependency detected 4.19.89-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.1/5339 is trying to acquire lock: 000000003a830798 (console_owner){-.-.}, at: console_trylock_spinning kernel/printk/printk.c:1669 [inline] 000000003a830798 (console_owner){-.-.}, at: vprintk_emit+0x3d5/0x6d0 kernel/printk/printk.c:1936 but task is already holding lock: 000000000e9ea7db (&(&port->lock)->rlock){-.-.}, at: pty_write+0xff/0x200 drivers/tty/pty.c:120 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&(&port->lock)->rlock){-.-.}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152 tty_port_tty_get+0x22/0x90 drivers/tty/tty_port.c:288 tty_port_default_wakeup+0x16/0x40 drivers/tty/tty_port.c:47 tty_port_tty_wakeup+0x57/0x70 drivers/tty/tty_port.c:390 uart_write_wakeup+0x46/0x70 drivers/tty/serial/serial_core.c:103 serial8250_tx_chars+0x495/0xaf0 drivers/tty/serial/8250/8250_port.c:1806 serial8250_handle_irq.part.0+0x261/0x2b0 drivers/tty/serial/8250/8250_port.c:1879 serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1865 [inline] serial8250_default_handle_irq+0xc0/0x150 drivers/tty/serial/8250/8250_port.c:1895 serial8250_interrupt+0xfc/0x1e0 drivers/tty/serial/8250/8250_core.c:125 __handle_irq_event_percpu+0x144/0x8f0 kernel/irq/handle.c:149 handle_irq_event_percpu+0x74/0x160 kernel/irq/handle.c:189 handle_irq_event+0xa7/0x134 kernel/irq/handle.c:206 handle_edge_irq+0x25e/0x8d0 kernel/irq/chip.c:797 generic_handle_irq_desc include/linux/irqdesc.h:155 [inline] handle_irq+0x39/0x50 arch/x86/kernel/irq_64.c:87 do_IRQ+0x99/0x1d0 arch/x86/kernel/irq.c:246 ret_from_intr+0x0/0x1e arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0x95/0xe0 kernel/locking/spinlock.c:184 spin_unlock_irqrestore include/linux/spinlock.h:384 [inline] uart_write+0x3a9/0x6e0 drivers/tty/serial/serial_core.c:612 process_output_block drivers/tty/n_tty.c:593 [inline] n_tty_write+0x3f9/0x1140 drivers/tty/n_tty.c:2331 do_tty_write drivers/tty/tty_io.c:960 [inline] tty_write+0x458/0x7a0 drivers/tty/tty_io.c:1044 redirected_tty_write+0xb2/0xc0 drivers/tty/tty_io.c:1065 __vfs_write+0x114/0x810 fs/read_write.c:485 vfs_write+0x20c/0x560 fs/read_write.c:549 ksys_write+0x14f/0x2d0 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:608 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #1 (&port_lock_key){-.-.}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152 serial8250_console_write+0x7ca/0x9f0 drivers/tty/serial/8250/8250_port.c:3247 univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:590 call_console_drivers kernel/printk/printk.c:1736 [inline] console_unlock+0xbdf/0x10d0 kernel/printk/printk.c:2429 vprintk_emit+0x280/0x6d0 kernel/printk/printk.c:1937 vprintk_default+0x28/0x30 kernel/printk/printk.c:1979 vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398 printk+0xba/0xed kernel/printk/printk.c:2012 register_console+0x77f/0xb90 kernel/printk/printk.c:2745 univ8250_console_init+0x3e/0x4b drivers/tty/serial/8250/8250_core.c:685 console_init+0x4f7/0x761 kernel/printk/printk.c:2831 start_kernel+0x59c/0x8c5 init/main.c:660 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:490 x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:471 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243 -> #0 (console_owner){-.-.}: lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903 console_trylock_spinning kernel/printk/printk.c:1690 [inline] vprintk_emit+0x412/0x6d0 kernel/printk/printk.c:1936 vprintk_default+0x28/0x30 kernel/printk/printk.c:1979 vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398 printk+0xba/0xed kernel/printk/printk.c:2012 fail_dump lib/fault-inject.c:44 [inline] should_fail+0x6f1/0x85c lib/fault-inject.c:149 __should_failslab+0x121/0x190 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1557 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x71/0x750 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline] __tty_buffer_request_room+0x1fb/0x5c0 drivers/tty/tty_buffer.c:268 tty_insert_flip_string_fixed_flag+0x93/0x1f0 drivers/tty/tty_buffer.c:313 tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x133/0x200 drivers/tty/pty.c:122 n_hdlc_send_frames+0x271/0x450 drivers/tty/n_hdlc.c:403 n_hdlc_tty_wakeup+0xae/0xd0 drivers/tty/n_hdlc.c:479 tty_ldisc_hangup+0x32e/0x630 drivers/tty/tty_ldisc.c:731 __tty_hangup.part.0+0x306/0x720 drivers/tty/tty_io.c:623 __tty_hangup drivers/tty/tty_io.c:573 [inline] tty_vhangup+0x22/0x30 drivers/tty/tty_io.c:696 pty_close+0x3b6/0x510 drivers/tty/pty.c:79 tty_release+0x3ba/0xe90 drivers/tty/tty_io.c:1678 __fput+0x2dd/0x8b0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Chain exists of: console_owner --> &port_lock_key --> &(&port->lock)->rlock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&(&port->lock)->rlock); lock(&port_lock_key); lock(&(&port->lock)->rlock); lock(console_owner); *** DEADLOCK *** 4 locks held by syz-executor.1/5339: #0: 00000000b4423cfc (&tty->legacy_mutex){+.+.}, at: tty_lock+0x73/0xb0 drivers/tty/tty_mutex.c:19 #1: 0000000017023d6d (&tty->legacy_mutex/1){+.+.}, at: tty_lock+0x73/0xb0 drivers/tty/tty_mutex.c:19 #2: 0000000008c38f95 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref+0x22/0x90 drivers/tty/tty_ldisc.c:293 #3: 000000000e9ea7db (&(&port->lock)->rlock){-.-.}, at: pty_write+0xff/0x200 drivers/tty/pty.c:120 stack backtrace: CPU: 0 PID: 5339 Comm: syz-executor.1 Not tainted 4.19.89-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+0x197/0x210 lib/dump_stack.c:118 print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1221 check_prev_add kernel/locking/lockdep.c:1861 [inline] check_prevs_add kernel/locking/lockdep.c:1974 [inline] validate_chain kernel/locking/lockdep.c:2415 [inline] __lock_acquire+0x2e19/0x49c0 kernel/locking/lockdep.c:3411 lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903 console_trylock_spinning kernel/printk/printk.c:1690 [inline] vprintk_emit+0x412/0x6d0 kernel/printk/printk.c:1936 vprintk_default+0x28/0x30 kernel/printk/printk.c:1979 vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398 printk+0xba/0xed kernel/printk/printk.c:2012 fail_dump lib/fault-inject.c:44 [inline] should_fail+0x6f1/0x85c lib/fault-inject.c:149 __should_failslab+0x121/0x190 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1557 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x71/0x750 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline] __tty_buffer_request_room+0x1fb/0x5c0 drivers/tty/tty_buffer.c:268 tty_insert_flip_string_fixed_flag+0x93/0x1f0 drivers/tty/tty_buffer.c:313 tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x133/0x200 drivers/tty/pty.c:122 n_hdlc_send_frames+0x271/0x450 drivers/tty/n_hdlc.c:403 n_hdlc_tty_wakeup+0xae/0xd0 drivers/tty/n_hdlc.c:479 tty_ldisc_hangup+0x32e/0x630 drivers/tty/tty_ldisc.c:731 __tty_hangup.part.0+0x306/0x720 drivers/tty/tty_io.c:623 __tty_hangup drivers/tty/tty_io.c:573 [inline] tty_vhangup+0x22/0x30 drivers/tty/tty_io.c:696 pty_close+0x3b6/0x510 drivers/tty/pty.c:79 tty_release+0x3ba/0xe90 drivers/tty/tty_io.c:1678 __fput+0x2dd/0x8b0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a909 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f2cb5db1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000124 RAX: 0000000000000003 RBX: 00007f2cb5db1c90 RCX: 000000000045a909 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000004 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2cb5db26d4 R13: 00000000004c11db R14: 00000000004d5000 R15: 0000000000000005 FAULT_INJECTION: forcing a failure. name fail_page_alloc, interval 1, probability 0, space 0, times 0 kobject: 'loop2' (00000000089aed19): kobject_uevent_env CPU: 0 PID: 5360 Comm: syz-executor.5 Not tainted 4.19.89-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: kobject: 'loop2' (00000000089aed19): fill_kobj_path: path = '/devices/virtual/block/loop2' __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0xa/0x1b lib/fault-inject.c:149 kobject: 'loop2' (00000000089aed19): kobject_uevent_env kobject: 'loop2' (00000000089aed19): fill_kobj_path: path = '/devices/virtual/block/loop2' should_fail_alloc_page mm/page_alloc.c:3086 [inline] prepare_alloc_pages mm/page_alloc.c:4344 [inline] __alloc_pages_nodemask+0x1ee/0x750 mm/page_alloc.c:4391 kobject: 'loop2' (00000000089aed19): kobject_uevent_env kobject: 'loop2' (00000000089aed19): fill_kobj_path: path = '/devices/virtual/block/loop2' __alloc_pages include/linux/gfp.h:496 [inline] __alloc_pages_node include/linux/gfp.h:509 [inline] kmem_getpages mm/slab.c:1412 [inline] cache_grow_begin+0x91/0x8c0 mm/slab.c:2682 cache_alloc_refill mm/slab.c:3049 [inline] ____cache_alloc mm/slab.c:3132 [inline] ____cache_alloc mm/slab.c:3115 [inline] __do_cache_alloc mm/slab.c:3354 [inline] slab_alloc mm/slab.c:3389 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x68b/0x750 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] do_tty_write drivers/tty/tty_io.c:942 [inline] tty_write+0x542/0x7a0 drivers/tty/tty_io.c:1044 __vfs_write+0x114/0x810 fs/read_write.c:485 vfs_write+0x20c/0x560 fs/read_write.c:549 ksys_write+0x14f/0x2d0 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:608 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a909 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f52d1490c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f52d1490c90 RCX: 000000000045a909 RDX: 00000000fffffec3 RSI: 0000000020000380 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f52d14916d4 R13: 00000000004c7ca0 R14: 00000000004e4d08 R15: 0000000000000005 kobject: 'loop0' (0000000084163e3c): kobject_uevent_env kobject: 'loop0' (0000000084163e3c): fill_kobj_path: path = '/devices/virtual/block/loop0' FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 5396 Comm: syz-executor.1 Not tainted 4.19.89-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+0x197/0x210 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0xa/0x1b lib/fault-inject.c:149 __should_failslab+0x121/0x190 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1557 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x71/0x750 mm/slab.c:3736 kobject: 'loop4' (00000000c6572998): kobject_uevent_env kmalloc include/linux/slab.h:520 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline] __tty_buffer_request_room+0x1fb/0x5c0 drivers/tty/tty_buffer.c:268 kobject: 'loop4' (00000000c6572998): fill_kobj_path: path = '/devices/virtual/block/loop4' tty_insert_flip_string_fixed_flag+0x93/0x1f0 drivers/tty/tty_buffer.c:313 tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x133/0x200 drivers/tty/pty.c:122 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 n_hdlc_send_frames+0x271/0x450 drivers/tty/n_hdlc.c:403 n_hdlc_tty_wakeup+0xae/0xd0 drivers/tty/n_hdlc.c:479 tty_ldisc_hangup+0x32e/0x630 drivers/tty/tty_ldisc.c:731 __tty_hangup.part.0+0x306/0x720 drivers/tty/tty_io.c:623 __tty_hangup drivers/tty/tty_io.c:573 [inline] tty_vhangup+0x22/0x30 drivers/tty/tty_io.c:696 pty_close+0x3b6/0x510 drivers/tty/pty.c:79 tty_release+0x3ba/0xe90 drivers/tty/tty_io.c:1678 __fput+0x2dd/0x8b0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a909 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f2cb5db1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000124 RAX: 0000000000000003 RBX: 00007f2cb5db1c90 RCX: 000000000045a909 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000004 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2cb5db26d4 R13: 00000000004c11db R14: 00000000004d5000 R15: 0000000000000005 CPU: 0 PID: 5404 Comm: syz-executor.5 Not tainted 4.19.89-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+0x197/0x210 lib/dump_stack.c:118 kobject: 'loop3' (000000008d97cfbf): kobject_uevent_env fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0xa/0x1b lib/fault-inject.c:149 __should_failslab+0x121/0x190 mm/failslab.c:32 kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' should_failslab+0x9/0x14 mm/slab_common.c:1557 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x71/0x750 mm/slab.c:3736 kobject: 'loop4' (00000000c6572998): kobject_uevent_env kmalloc include/linux/slab.h:520 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline] __tty_buffer_request_room+0x1fb/0x5c0 drivers/tty/tty_buffer.c:268 tty_insert_flip_string_fixed_flag+0x93/0x1f0 drivers/tty/tty_buffer.c:313 kobject: 'loop4' (00000000c6572998): fill_kobj_path: path = '/devices/virtual/block/loop4' tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x133/0x200 drivers/tty/pty.c:122 n_hdlc_send_frames+0x271/0x450 drivers/tty/n_hdlc.c:403 kobject: 'loop3' (000000008d97cfbf): kobject_uevent_env n_hdlc_tty_write+0x5c8/0x6c0 drivers/tty/n_hdlc.c:713 kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (0000000057447756): kobject_uevent_env do_tty_write drivers/tty/tty_io.c:960 [inline] tty_write+0x458/0x7a0 drivers/tty/tty_io.c:1044 kobject: 'loop5' (0000000057447756): fill_kobj_path: path = '/devices/virtual/block/loop5' __vfs_write+0x114/0x810 fs/read_write.c:485 vfs_write+0x20c/0x560 fs/read_write.c:549 ksys_write+0x14f/0x2d0 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:608 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a909 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f52d1490c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f52d1490c90 RCX: 000000000045a909 RDX: 00000000fffffec3 RSI: 0000000020000380 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f52d14916d4 R13: 00000000004c7ca0 R14: 00000000004e4d08 R15: 0000000000000005 kobject: 'loop0' (0000000084163e3c): kobject_uevent_env kobject: 'loop0' (0000000084163e3c): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (0000000057447756): kobject_uevent_env FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 5424 Comm: syz-executor.5 Not tainted 4.19.89-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+0x197/0x210 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0xa/0x1b lib/fault-inject.c:149 __should_failslab+0x121/0x190 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1557 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x71/0x750 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline] __tty_buffer_request_room+0x1fb/0x5c0 drivers/tty/tty_buffer.c:268 tty_insert_flip_string_fixed_flag+0x93/0x1f0 drivers/tty/tty_buffer.c:313 tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x133/0x200 drivers/tty/pty.c:122 n_hdlc_send_frames+0x271/0x450 drivers/tty/n_hdlc.c:403 n_hdlc_tty_write+0x5c8/0x6c0 drivers/tty/n_hdlc.c:713 do_tty_write drivers/tty/tty_io.c:960 [inline] tty_write+0x458/0x7a0 drivers/tty/tty_io.c:1044 __vfs_write+0x114/0x810 fs/read_write.c:485 vfs_write+0x20c/0x560 fs/read_write.c:549 ksys_write+0x14f/0x2d0 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:608 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a909 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f52d1490c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f52d1490c90 RCX: 000000000045a909 RDX: 00000000fffffec3 RSI: 0000000020000380 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f52d14916d4 R13: 00000000004c7ca0 R14: 00000000004e4d08 R15: 0000000000000005 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 5431 Comm: syz-executor.1 Not tainted 4.19.89-syzkaller #0 kobject: 'loop5' (0000000057447756): fill_kobj_path: path = '/devices/virtual/block/loop5' 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+0x197/0x210 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0xa/0x1b lib/fault-inject.c:149 __should_failslab+0x121/0x190 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1557 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x71/0x750 mm/slab.c:3736 kobject: 'loop3' (000000008d97cfbf): kobject_uevent_env kmalloc include/linux/slab.h:520 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline] __tty_buffer_request_room+0x1fb/0x5c0 drivers/tty/tty_buffer.c:268 tty_insert_flip_string_fixed_flag+0x93/0x1f0 drivers/tty/tty_buffer.c:313 kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x133/0x200 drivers/tty/pty.c:122 kobject: 'loop2' (00000000089aed19): kobject_uevent_env n_hdlc_send_frames+0x271/0x450 drivers/tty/n_hdlc.c:403 kobject: 'loop2' (00000000089aed19): fill_kobj_path: path = '/devices/virtual/block/loop2' n_hdlc_tty_wakeup+0xae/0xd0 drivers/tty/n_hdlc.c:479 tty_ldisc_hangup+0x32e/0x630 drivers/tty/tty_ldisc.c:731 kobject: 'loop0' (0000000084163e3c): kobject_uevent_env __tty_hangup.part.0+0x306/0x720 drivers/tty/tty_io.c:623 kobject: 'loop0' (0000000084163e3c): fill_kobj_path: path = '/devices/virtual/block/loop0' __tty_hangup drivers/tty/tty_io.c:573 [inline] tty_vhangup+0x22/0x30 drivers/tty/tty_io.c:696 pty_close+0x3b6/0x510 drivers/tty/pty.c:79 kobject: 'loop5' (0000000057447756): kobject_uevent_env tty_release+0x3ba/0xe90 drivers/tty/tty_io.c:1678 kobject: 'loop5' (0000000057447756): fill_kobj_path: path = '/devices/virtual/block/loop5' __fput+0x2dd/0x8b0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a909 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 kobject: 'loop3' (000000008d97cfbf): kobject_uevent_env RSP: 002b:00007f2cb5db1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000124 RAX: 0000000000000003 RBX: 00007f2cb5db1c90 RCX: 000000000045a909 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000004 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2cb5db26d4 R13: 00000000004c11db R14: 00000000004d5000 R15: 0000000000000005 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 5446 Comm: syz-executor.5 Not tainted 4.19.89-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: kobject: 'loop4' (00000000c6572998): kobject_uevent_env __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0xa/0x1b lib/fault-inject.c:149 kobject: 'loop4' (00000000c6572998): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (0000000084163e3c): kobject_uevent_env __should_failslab+0x121/0x190 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1557 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x71/0x750 mm/slab.c:3736 kobject: 'loop0' (0000000084163e3c): fill_kobj_path: path = '/devices/virtual/block/loop0' kmalloc include/linux/slab.h:520 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline] __tty_buffer_request_room+0x1fb/0x5c0 drivers/tty/tty_buffer.c:268 tty_insert_flip_string_fixed_flag+0x93/0x1f0 drivers/tty/tty_buffer.c:313 kobject: 'loop2' (00000000089aed19): kobject_uevent_env tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x133/0x200 drivers/tty/pty.c:122 n_hdlc_send_frames+0x271/0x450 drivers/tty/n_hdlc.c:403 n_hdlc_tty_write+0x5c8/0x6c0 drivers/tty/n_hdlc.c:713 kobject: 'loop2' (00000000089aed19): fill_kobj_path: path = '/devices/virtual/block/loop2' do_tty_write drivers/tty/tty_io.c:960 [inline] tty_write+0x458/0x7a0 drivers/tty/tty_io.c:1044 __vfs_write+0x114/0x810 fs/read_write.c:485 kobject: 'loop4' (00000000c6572998): kobject_uevent_env kobject: 'loop4' (00000000c6572998): fill_kobj_path: path = '/devices/virtual/block/loop4' vfs_write+0x20c/0x560 fs/read_write.c:549 ksys_write+0x14f/0x2d0 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:608 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a909 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 kobject: 'loop4' (00000000c6572998): kobject_uevent_env RSP: 002b:00007f52d1490c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f52d1490c90 RCX: 000000000045a909 kobject: 'loop4' (00000000c6572998): fill_kobj_path: path = '/devices/virtual/block/loop4' RDX: 00000000fffffec3 RSI: 0000000020000380 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f52d14916d4 R13: 00000000004c7ca0 R14: 00000000004e4d08 R15: 0000000000000005 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 5461 Comm: syz-executor.1 Not tainted 4.19.89-syzkaller #0 kobject: 'loop3' (000000008d97cfbf): kobject_uevent_env 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+0x197/0x210 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0xa/0x1b lib/fault-inject.c:149 kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' __should_failslab+0x121/0x190 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1557 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x71/0x750 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline] __tty_buffer_request_room+0x1fb/0x5c0 drivers/tty/tty_buffer.c:268 tty_insert_flip_string_fixed_flag+0x93/0x1f0 drivers/tty/tty_buffer.c:313 tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x133/0x200 drivers/tty/pty.c:122 n_hdlc_send_frames+0x271/0x450 drivers/tty/n_hdlc.c:403 n_hdlc_tty_wakeup+0xae/0xd0 drivers/tty/n_hdlc.c:479 tty_ldisc_hangup+0x32e/0x630 drivers/tty/tty_ldisc.c:731 __tty_hangup.part.0+0x306/0x720 drivers/tty/tty_io.c:623 kobject: 'loop5' (0000000057447756): kobject_uevent_env __tty_hangup drivers/tty/tty_io.c:573 [inline] tty_vhangup+0x22/0x30 drivers/tty/tty_io.c:696 pty_close+0x3b6/0x510 drivers/tty/pty.c:79 tty_release+0x3ba/0xe90 drivers/tty/tty_io.c:1678 kobject: 'loop5' (0000000057447756): fill_kobj_path: path = '/devices/virtual/block/loop5' __fput+0x2dd/0x8b0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 kobject: 'loop0' (0000000084163e3c): kobject_uevent_env task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296 kobject: 'loop0' (0000000084163e3c): fill_kobj_path: path = '/devices/virtual/block/loop0' entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a909 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f2cb5db1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000124 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 RAX: 0000000000000003 RBX: 00007f2cb5db1c90 RCX: 000000000045a909 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000004 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2cb5db26d4 R13: 00000000004c11db R14: 00000000004d5000 R15: 0000000000000005 CPU: 1 PID: 5481 Comm: syz-executor.5 Not tainted 4.19.89-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+0x197/0x210 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0xa/0x1b lib/fault-inject.c:149 __should_failslab+0x121/0x190 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1557 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x71/0x750 mm/slab.c:3736 kobject: 'loop3' (000000008d97cfbf): kobject_uevent_env kmalloc include/linux/slab.h:520 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline] __tty_buffer_request_room+0x1fb/0x5c0 drivers/tty/tty_buffer.c:268 tty_insert_flip_string_fixed_flag+0x93/0x1f0 drivers/tty/tty_buffer.c:313 kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x133/0x200 drivers/tty/pty.c:122 n_hdlc_send_frames+0x271/0x450 drivers/tty/n_hdlc.c:403 n_hdlc_tty_write+0x5c8/0x6c0 drivers/tty/n_hdlc.c:713 kobject: 'loop0' (0000000084163e3c): kobject_uevent_env kobject: 'loop0' (0000000084163e3c): fill_kobj_path: path = '/devices/virtual/block/loop0' do_tty_write drivers/tty/tty_io.c:960 [inline] tty_write+0x458/0x7a0 drivers/tty/tty_io.c:1044 __vfs_write+0x114/0x810 fs/read_write.c:485 vfs_write+0x20c/0x560 fs/read_write.c:549 ksys_write+0x14f/0x2d0 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:608 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a909 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f52d1490c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f52d1490c90 RCX: 000000000045a909 RDX: 00000000fffffec3 RSI: 0000000020000380 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f52d14916d4 R13: 00000000004c7ca0 R14: 00000000004e4d08 R15: 0000000000000005 kobject: 'loop2' (00000000089aed19): kobject_uevent_env kobject: 'loop2' (00000000089aed19): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop4' (00000000c6572998): kobject_uevent_env FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 5501 Comm: syz-executor.5 Not tainted 4.19.89-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 kobject: 'loop4' (00000000c6572998): fill_kobj_path: path = '/devices/virtual/block/loop4' Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0xa/0x1b lib/fault-inject.c:149 kobject: 'loop5' (0000000057447756): kobject_uevent_env __should_failslab+0x121/0x190 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1557 kobject: 'loop5' (0000000057447756): fill_kobj_path: path = '/devices/virtual/block/loop5' slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x71/0x750 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline] __tty_buffer_request_room+0x1fb/0x5c0 drivers/tty/tty_buffer.c:268 tty_insert_flip_string_fixed_flag+0x93/0x1f0 drivers/tty/tty_buffer.c:313 kobject: 'loop0' (0000000084163e3c): kobject_uevent_env tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x133/0x200 drivers/tty/pty.c:122 n_hdlc_send_frames+0x271/0x450 drivers/tty/n_hdlc.c:403 n_hdlc_tty_write+0x5c8/0x6c0 drivers/tty/n_hdlc.c:713 kobject: 'loop0' (0000000084163e3c): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (0000000084163e3c): kobject_uevent_env do_tty_write drivers/tty/tty_io.c:960 [inline] tty_write+0x458/0x7a0 drivers/tty/tty_io.c:1044 kobject: 'loop0' (0000000084163e3c): fill_kobj_path: path = '/devices/virtual/block/loop0' __vfs_write+0x114/0x810 fs/read_write.c:485 vfs_write+0x20c/0x560 fs/read_write.c:549 ksys_write+0x14f/0x2d0 fs/read_write.c:599 kobject: 'loop3' (000000008d97cfbf): kobject_uevent_env __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:608 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a909 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f52d1490c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 RAX: ffffffffffffffda RBX: 00007f52d1490c90 RCX: 000000000045a909 RDX: 00000000fffffec3 RSI: 0000000020000380 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f52d14916d4 R13: 00000000004c7ca0 R14: 00000000004e4d08 R15: 0000000000000005 CPU: 0 PID: 5515 Comm: syz-executor.1 Not tainted 4.19.89-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+0x197/0x210 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0xa/0x1b lib/fault-inject.c:149 __should_failslab+0x121/0x190 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1557 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x71/0x750 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline] __tty_buffer_request_room+0x1fb/0x5c0 drivers/tty/tty_buffer.c:268 tty_insert_flip_string_fixed_flag+0x93/0x1f0 drivers/tty/tty_buffer.c:313 tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x133/0x200 drivers/tty/pty.c:122 n_hdlc_send_frames+0x271/0x450 drivers/tty/n_hdlc.c:403 n_hdlc_tty_wakeup+0xae/0xd0 drivers/tty/n_hdlc.c:479 tty_ldisc_hangup+0x32e/0x630 drivers/tty/tty_ldisc.c:731 kobject: 'loop2' (00000000089aed19): kobject_uevent_env __tty_hangup.part.0+0x306/0x720 drivers/tty/tty_io.c:623 kobject: 'loop2' (00000000089aed19): fill_kobj_path: path = '/devices/virtual/block/loop2' __tty_hangup drivers/tty/tty_io.c:573 [inline] tty_vhangup+0x22/0x30 drivers/tty/tty_io.c:696 pty_close+0x3b6/0x510 drivers/tty/pty.c:79 kobject: 'loop4' (00000000c6572998): kobject_uevent_env tty_release+0x3ba/0xe90 drivers/tty/tty_io.c:1678 kobject: 'loop4' (00000000c6572998): fill_kobj_path: path = '/devices/virtual/block/loop4' __fput+0x2dd/0x8b0 fs/file_table.c:278 kobject: 'loop2' (00000000089aed19): kobject_uevent_env ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296 kobject: 'loop2' (00000000089aed19): fill_kobj_path: path = '/devices/virtual/block/loop2' entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a909 kobject: 'loop5' (0000000057447756): kobject_uevent_env Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f2cb5db1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000124 RAX: 0000000000000003 RBX: 00007f2cb5db1c90 RCX: 000000000045a909 kobject: 'loop5' (0000000057447756): fill_kobj_path: path = '/devices/virtual/block/loop5' RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000004 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2cb5db26d4 R13: 00000000004c11db R14: 00000000004d5000 R15: 0000000000000005 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 5532 Comm: syz-executor.5 Not tainted 4.19.89-syzkaller #0 kobject: 'loop0' (0000000084163e3c): kobject_uevent_env Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 kobject: 'loop0' (0000000084163e3c): fill_kobj_path: path = '/devices/virtual/block/loop0' Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0xa/0x1b lib/fault-inject.c:149 __should_failslab+0x121/0x190 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1557 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x71/0x750 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline] __tty_buffer_request_room+0x1fb/0x5c0 drivers/tty/tty_buffer.c:268 tty_insert_flip_string_fixed_flag+0x93/0x1f0 drivers/tty/tty_buffer.c:313 tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x133/0x200 drivers/tty/pty.c:122 n_hdlc_send_frames+0x271/0x450 drivers/tty/n_hdlc.c:403 n_hdlc_tty_write+0x5c8/0x6c0 drivers/tty/n_hdlc.c:713 do_tty_write drivers/tty/tty_io.c:960 [inline] tty_write+0x458/0x7a0 drivers/tty/tty_io.c:1044 __vfs_write+0x114/0x810 fs/read_write.c:485 kobject: 'loop0' (0000000084163e3c): kobject_uevent_env kobject: 'loop0' (0000000084163e3c): fill_kobj_path: path = '/devices/virtual/block/loop0' vfs_write+0x20c/0x560 fs/read_write.c:549 ksys_write+0x14f/0x2d0 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:608 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a909 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 kobject: 'loop0' (0000000084163e3c): kobject_uevent_env RSP: 002b:00007f52d1490c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f52d1490c90 RCX: 000000000045a909 RDX: 00000000fffffec3 RSI: 0000000020000380 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 kobject: 'loop0' (0000000084163e3c): fill_kobj_path: path = '/devices/virtual/block/loop0' R10: 0000000000000000 R11: 0000000000000246 R12: 00007f52d14916d4 R13: 00000000004c7ca0 R14: 00000000004e4d08 R15: 0000000000000005 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 5553 Comm: syz-executor.1 Not tainted 4.19.89-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+0x197/0x210 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0xa/0x1b lib/fault-inject.c:149 __should_failslab+0x121/0x190 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1557 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x71/0x750 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline] __tty_buffer_request_room+0x1fb/0x5c0 drivers/tty/tty_buffer.c:268 tty_insert_flip_string_fixed_flag+0x93/0x1f0 drivers/tty/tty_buffer.c:313 kobject: 'loop3' (000000008d97cfbf): kobject_uevent_env tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x133/0x200 drivers/tty/pty.c:122 kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' n_hdlc_send_frames+0x271/0x450 drivers/tty/n_hdlc.c:403 kobject: 'loop4' (00000000c6572998): kobject_uevent_env n_hdlc_tty_wakeup+0xae/0xd0 drivers/tty/n_hdlc.c:479 tty_ldisc_hangup+0x32e/0x630 drivers/tty/tty_ldisc.c:731 kobject: 'loop4' (00000000c6572998): fill_kobj_path: path = '/devices/virtual/block/loop4' __tty_hangup.part.0+0x306/0x720 drivers/tty/tty_io.c:623 kobject: 'loop5' (0000000057447756): kobject_uevent_env __tty_hangup drivers/tty/tty_io.c:573 [inline] tty_vhangup+0x22/0x30 drivers/tty/tty_io.c:696 pty_close+0x3b6/0x510 drivers/tty/pty.c:79 kobject: 'loop5' (0000000057447756): fill_kobj_path: path = '/devices/virtual/block/loop5' tty_release+0x3ba/0xe90 drivers/tty/tty_io.c:1678 kobject: 'loop3' (000000008d97cfbf): kobject_uevent_env __fput+0x2dd/0x8b0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:167 kobject: 'loop4' (00000000c6572998): kobject_uevent_env prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe kobject: 'loop4' (00000000c6572998): fill_kobj_path: path = '/devices/virtual/block/loop4' RIP: 0033:0x45a909 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f2cb5db1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000124 RAX: 0000000000000003 RBX: 00007f2cb5db1c90 RCX: 000000000045a909 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000004 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2cb5db26d4 R13: 00000000004c11db R14: 00000000004d5000 R15: 0000000000000005 kobject: 'loop0' (0000000084163e3c): kobject_uevent_env kobject: 'loop0' (0000000084163e3c): fill_kobj_path: path = '/devices/virtual/block/loop0' FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 5573 Comm: syz-executor.5 Not tainted 4.19.89-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: kobject: 'loop3' (000000008d97cfbf): kobject_uevent_env __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0xa/0x1b lib/fault-inject.c:149 kobject: 'loop4' (00000000c6572998): kobject_uevent_env __should_failslab+0x121/0x190 mm/failslab.c:32 kobject: 'loop4' (00000000c6572998): fill_kobj_path: path = '/devices/virtual/block/loop4' should_failslab+0x9/0x14 mm/slab_common.c:1557 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x71/0x750 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline] __tty_buffer_request_room+0x1fb/0x5c0 drivers/tty/tty_buffer.c:268 tty_insert_flip_string_fixed_flag+0x93/0x1f0 drivers/tty/tty_buffer.c:313 tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x133/0x200 drivers/tty/pty.c:122 n_hdlc_send_frames+0x271/0x450 drivers/tty/n_hdlc.c:403 n_hdlc_tty_write+0x5c8/0x6c0 drivers/tty/n_hdlc.c:713 do_tty_write drivers/tty/tty_io.c:960 [inline] tty_write+0x458/0x7a0 drivers/tty/tty_io.c:1044 __vfs_write+0x114/0x810 fs/read_write.c:485 kobject: 'loop4' (00000000c6572998): kobject_uevent_env kobject: 'loop4' (00000000c6572998): fill_kobj_path: path = '/devices/virtual/block/loop4' vfs_write+0x20c/0x560 fs/read_write.c:549 ksys_write+0x14f/0x2d0 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:608 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe kobject: 'loop4' (00000000c6572998): kobject_uevent_env RIP: 0033:0x45a909 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f52d1490c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 kobject: 'loop4' (00000000c6572998): fill_kobj_path: path = '/devices/virtual/block/loop4' RAX: ffffffffffffffda RBX: 00007f52d1490c90 RCX: 000000000045a909 RDX: 00000000fffffec3 RSI: 0000000020000380 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f52d14916d4 R13: 00000000004c7ca0 R14: 00000000004e4d08 R15: 0000000000000005 kobject: 'loop4' (00000000c6572998): kobject_uevent_env kobject: 'loop4' (00000000c6572998): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (0000000084163e3c): kobject_uevent_env kobject: 'loop0' (0000000084163e3c): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop2' (00000000089aed19): kobject_uevent_env FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 kobject: 'loop2' (00000000089aed19): fill_kobj_path: path = '/devices/virtual/block/loop2' CPU: 0 PID: 5616 Comm: syz-executor.5 Not tainted 4.19.89-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: kobject: 'loop5' (0000000057447756): kobject_uevent_env __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0xa/0x1b lib/fault-inject.c:149 kobject: 'loop5' (0000000057447756): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (000000008d97cfbf): kobject_uevent_env __should_failslab+0x121/0x190 mm/failslab.c:32 kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' should_failslab+0x9/0x14 mm/slab_common.c:1557 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x71/0x750 mm/slab.c:3736 kobject: 'loop4' (00000000c6572998): kobject_uevent_env kmalloc include/linux/slab.h:520 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline] __tty_buffer_request_room+0x1fb/0x5c0 drivers/tty/tty_buffer.c:268 tty_insert_flip_string_fixed_flag+0x93/0x1f0 drivers/tty/tty_buffer.c:313 tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x133/0x200 drivers/tty/pty.c:122 kobject: 'loop4' (00000000c6572998): fill_kobj_path: path = '/devices/virtual/block/loop4' n_hdlc_send_frames+0x271/0x450 drivers/tty/n_hdlc.c:403 n_hdlc_tty_write+0x5c8/0x6c0 drivers/tty/n_hdlc.c:713 kobject: 'loop3' (000000008d97cfbf): kobject_uevent_env kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' do_tty_write drivers/tty/tty_io.c:960 [inline] tty_write+0x458/0x7a0 drivers/tty/tty_io.c:1044 kobject: 'loop3' (000000008d97cfbf): kobject_uevent_env __vfs_write+0x114/0x810 fs/read_write.c:485 kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' vfs_write+0x20c/0x560 fs/read_write.c:549 ksys_write+0x14f/0x2d0 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:608 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 kobject: 'loop0' (0000000084163e3c): kobject_uevent_env entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a909 kobject: 'loop0' (0000000084163e3c): fill_kobj_path: path = '/devices/virtual/block/loop0' Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f52d1490c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f52d1490c90 RCX: 000000000045a909 kobject: 'loop3' (000000008d97cfbf): kobject_uevent_env RDX: 00000000fffffec3 RSI: 0000000020000380 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f52d14916d4 R13: 00000000004c7ca0 R14: 00000000004e4d08 R15: 0000000000000005 kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (00000000089aed19): kobject_uevent_env kobject: 'loop2' (00000000089aed19): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop4' (00000000c6572998): kobject_uevent_env kobject: 'loop4' (00000000c6572998): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (0000000057447756): kobject_uevent_env kobject: 'loop5' (0000000057447756): fill_kobj_path: path = '/devices/virtual/block/loop5' FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 5658 Comm: syz-executor.5 Not tainted 4.19.89-syzkaller #0 kobject: 'loop0' (0000000084163e3c): kobject_uevent_env 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+0x197/0x210 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0xa/0x1b lib/fault-inject.c:149 kobject: 'loop0' (0000000084163e3c): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (000000008d97cfbf): kobject_uevent_env __should_failslab+0x121/0x190 mm/failslab.c:32 kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' should_failslab+0x9/0x14 mm/slab_common.c:1557 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x71/0x750 mm/slab.c:3736 kobject: 'loop3' (000000008d97cfbf): kobject_uevent_env kmalloc include/linux/slab.h:520 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline] __tty_buffer_request_room+0x1fb/0x5c0 drivers/tty/tty_buffer.c:268 kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' tty_insert_flip_string_fixed_flag+0x93/0x1f0 drivers/tty/tty_buffer.c:313 tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x133/0x200 drivers/tty/pty.c:122 n_hdlc_send_frames+0x271/0x450 drivers/tty/n_hdlc.c:403 n_hdlc_tty_write+0x5c8/0x6c0 drivers/tty/n_hdlc.c:713 do_tty_write drivers/tty/tty_io.c:960 [inline] tty_write+0x458/0x7a0 drivers/tty/tty_io.c:1044 __vfs_write+0x114/0x810 fs/read_write.c:485 kobject: 'loop4' (00000000c6572998): kobject_uevent_env kobject: 'loop4' (00000000c6572998): fill_kobj_path: path = '/devices/virtual/block/loop4' vfs_write+0x20c/0x560 fs/read_write.c:549 ksys_write+0x14f/0x2d0 fs/read_write.c:599 kobject: 'loop3' (000000008d97cfbf): kobject_uevent_env __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:608 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' RIP: 0033:0x45a909 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f52d1490c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 kobject: 'loop2' (00000000089aed19): kobject_uevent_env RAX: ffffffffffffffda RBX: 00007f52d1490c90 RCX: 000000000045a909 RDX: 00000000fffffec3 RSI: 0000000020000380 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f52d14916d4 R13: 00000000004c7ca0 R14: 00000000004e4d08 R15: 0000000000000005 kobject: 'loop2' (00000000089aed19): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop0' (0000000084163e3c): kobject_uevent_env kobject: 'loop0' (0000000084163e3c): fill_kobj_path: path = '/devices/virtual/block/loop0' FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 kobject: 'loop2' (00000000089aed19): kobject_uevent_env CPU: 1 PID: 5683 Comm: syz-executor.5 Not tainted 4.19.89-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+0x197/0x210 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0xa/0x1b lib/fault-inject.c:149 kobject: 'loop2' (00000000089aed19): fill_kobj_path: path = '/devices/virtual/block/loop2' __should_failslab+0x121/0x190 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1557 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x71/0x750 mm/slab.c:3736 kobject: 'loop0' (0000000084163e3c): kobject_uevent_env kmalloc include/linux/slab.h:520 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline] __tty_buffer_request_room+0x1fb/0x5c0 drivers/tty/tty_buffer.c:268 kobject: 'loop0' (0000000084163e3c): fill_kobj_path: path = '/devices/virtual/block/loop0' tty_insert_flip_string_fixed_flag+0x93/0x1f0 drivers/tty/tty_buffer.c:313 tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x133/0x200 drivers/tty/pty.c:122 n_hdlc_send_frames+0x271/0x450 drivers/tty/n_hdlc.c:403 n_hdlc_tty_write+0x5c8/0x6c0 drivers/tty/n_hdlc.c:713 do_tty_write drivers/tty/tty_io.c:960 [inline] tty_write+0x458/0x7a0 drivers/tty/tty_io.c:1044 __vfs_write+0x114/0x810 fs/read_write.c:485 vfs_write+0x20c/0x560 fs/read_write.c:549 ksys_write+0x14f/0x2d0 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:608 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a909 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f52d1490c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f52d1490c90 RCX: 000000000045a909 RDX: 00000000fffffec3 RSI: 0000000020000380 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f52d14916d4 R13: 00000000004c7ca0 R14: 00000000004e4d08 R15: 0000000000000005 kobject: 'loop5' (0000000057447756): kobject_uevent_env kobject: 'loop5' (0000000057447756): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (000000008d97cfbf): kobject_uevent_env kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (0000000084163e3c): kobject_uevent_env kobject: 'loop0' (0000000084163e3c): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop2' (00000000089aed19): kobject_uevent_env kobject: 'loop2' (00000000089aed19): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop4' (00000000c6572998): kobject_uevent_env kobject: 'loop4' (00000000c6572998): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (0000000057447756): kobject_uevent_env kobject: 'loop5' (0000000057447756): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (00000000c6572998): kobject_uevent_env kobject: 'loop4' (00000000c6572998): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (000000008d97cfbf): kobject_uevent_env kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (00000000089aed19): kobject_uevent_env kobject: 'loop2' (00000000089aed19): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop0' (0000000084163e3c): kobject_uevent_env kobject: 'loop0' (0000000084163e3c): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (0000000057447756): kobject_uevent_env kobject: 'loop5' (0000000057447756): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (000000008d97cfbf): kobject_uevent_env kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (00000000c6572998): kobject_uevent_env kobject: 'loop4' (00000000c6572998): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (0000000084163e3c): kobject_uevent_env kobject: 'loop0' (0000000084163e3c): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop2' (00000000089aed19): kobject_uevent_env kobject: 'loop2' (00000000089aed19): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (000000008d97cfbf): kobject_uevent_env kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (0000000084163e3c): kobject_uevent_env kobject: 'loop0' (0000000084163e3c): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (0000000057447756): kobject_uevent_env kobject: 'loop5' (0000000057447756): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop2' (00000000089aed19): kobject_uevent_env kobject: 'loop2' (00000000089aed19): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (000000008d97cfbf): kobject_uevent_env kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop3' (000000008d97cfbf): kobject_uevent_env kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (00000000089aed19): kobject_uevent_env kobject: 'loop2' (00000000089aed19): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop4' (00000000c6572998): kobject_uevent_env kobject: 'loop4' (00000000c6572998): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (0000000084163e3c): kobject_uevent_env kobject: 'loop0' (0000000084163e3c): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (0000000057447756): kobject_uevent_env kobject: 'loop5' (0000000057447756): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (0000000084163e3c): kobject_uevent_env kobject: 'loop0' (0000000084163e3c): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (000000008d97cfbf): kobject_uevent_env kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (00000000089aed19): kobject_uevent_env kobject: 'loop2' (00000000089aed19): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (0000000057447756): kobject_uevent_env kobject: 'loop5' (0000000057447756): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (00000000c6572998): kobject_uevent_env kobject: 'loop4' (00000000c6572998): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (0000000084163e3c): kobject_uevent_env kobject: 'loop0' (0000000084163e3c): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (000000008d97cfbf): kobject_uevent_env kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (00000000089aed19): kobject_uevent_env kobject: 'loop2' (00000000089aed19): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (0000000057447756): kobject_uevent_env kobject: 'loop5' (0000000057447756): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (000000008d97cfbf): kobject_uevent_env kobject: 'loop3' (000000008d97cfbf): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (00000000c6572998): kobject_uevent_env kobject: 'loop4' (00000000c6572998): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (00000000089aed19): kobject_uevent_env kobject: 'loop2' (00000000089aed19): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (0000000057447756): kobject_uevent_env kobject: 'loop5' (0000000057447756): fill_kobj_path: path = '/devices/virtual/block/loop5'