FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 0 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.1.962/10182 is trying to acquire lock: ffffffff8e2d1540 (console_owner){-.-.}-{0:0}, at: console_lock_spinning_enable+0x61/0x80 kernel/printk/printk.c:1897 but task is already holding lock: ffff88802b239820 (&pool->lock){-.-.}-{2:2}, at: __queue_work+0x6c9/0x1160 kernel/workqueue.c:2298 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&pool->lock){-.-.}-{2:2}: __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 __queue_work+0x26b/0x1160 kernel/workqueue.c:2301 queue_work_on+0x15f/0x1f0 kernel/workqueue.c:2392 queue_work include/linux/workqueue.h:669 [inline] rpm_suspend+0xeba/0x11d0 drivers/base/power/runtime.c:688 rpm_idle+0x607/0x780 drivers/base/power/runtime.c:562 __pm_runtime_idle+0xba/0x1a0 drivers/base/power/runtime.c:1129 pm_runtime_put include/linux/pm_runtime.h:563 [inline] __device_attach+0x37e/0x4b0 drivers/base/dd.c:1049 bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537 device_add+0x1148/0x1aa0 drivers/base/core.c:3689 serial_base_port_add+0x362/0x4c0 drivers/tty/serial/serial_base_bus.c:183 serial_core_port_device_add drivers/tty/serial/serial_core.c:3284 [inline] serial_core_register_port+0x13c/0x25d0 drivers/tty/serial/serial_core.c:3323 serial8250_register_8250_port+0x15a3/0x23e0 drivers/tty/serial/8250/8250_core.c:818 serial_pnp_probe+0x431/0x910 drivers/tty/serial/8250/8250_pnp.c:480 pnp_device_probe+0x2a5/0x4d0 drivers/pnp/driver.c:111 call_driver_probe drivers/base/dd.c:581 [inline] really_probe+0x241/0xa90 drivers/base/dd.c:659 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:801 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831 __driver_attach+0x283/0x580 drivers/base/dd.c:1217 bus_for_each_dev+0x13e/0x1d0 drivers/base/bus.c:370 bus_add_driver+0x2e9/0x690 drivers/base/bus.c:678 driver_register+0x15c/0x4b0 drivers/base/driver.c:249 serial8250_init+0xc9/0x1e0 drivers/tty/serial/8250/8250_platform.c:320 do_one_initcall+0x120/0x6e0 init/main.c:1283 do_initcall_level init/main.c:1345 [inline] do_initcalls init/main.c:1361 [inline] do_basic_setup init/main.c:1380 [inline] kernel_init_freeable+0x5c2/0x910 init/main.c:1593 kernel_init+0x1c/0x2b0 init/main.c:1483 ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #2 (&dev->power.lock){-...}-{3:3}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 __pm_runtime_resume+0xa9/0x170 drivers/base/power/runtime.c:1196 pm_runtime_get include/linux/pm_runtime.h:494 [inline] __uart_start+0x1b0/0x500 drivers/tty/serial/serial_core.c:149 uart_write+0x218/0xb30 drivers/tty/serial/serial_core.c:633 process_output_block drivers/tty/n_tty.c:561 [inline] n_tty_write+0x41b/0x11e0 drivers/tty/n_tty.c:2377 iterate_tty_write drivers/tty/tty_io.c:1006 [inline] file_tty_write.constprop.0+0x500/0x9b0 drivers/tty/tty_io.c:1081 tty_write drivers/tty/tty_io.c:1102 [inline] redirected_tty_write drivers/tty/tty_io.c:1125 [inline] redirected_tty_write+0xd4/0x150 drivers/tty/tty_io.c:1105 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x7d3/0x11d0 fs/read_write.c:686 ksys_write+0x12a/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&port_lock_key){-.-.}-{3:3}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 uart_port_lock_irqsave include/linux/serial_core.h:717 [inline] serial8250_console_write+0x181/0x1890 drivers/tty/serial/8250/8250_port.c:3301 console_emit_next_record kernel/printk/printk.c:3111 [inline] console_flush_all+0x801/0xc60 kernel/printk/printk.c:3199 __console_flush_and_unlock kernel/printk/printk.c:3258 [inline] console_unlock+0xd8/0x210 kernel/printk/printk.c:3298 vprintk_emit+0x3d7/0x680 kernel/printk/printk.c:2423 _printk+0xc7/0x100 kernel/printk/printk.c:2448 register_console+0xc2d/0x11b0 kernel/printk/printk.c:4099 univ8250_console_init+0x5f/0x90 drivers/tty/serial/8250/8250_core.c:511 console_init+0x14f/0x680 kernel/printk/printk.c:4298 start_kernel+0x29f/0x4e0 init/main.c:1048 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:310 x86_64_start_kernel+0x130/0x190 arch/x86/kernel/head64.c:291 common_startup_64+0x13e/0x148 -> #0 (console_owner){-.-.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x12a6/0x1ce0 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825 console_lock_spinning_enable+0x72/0x80 kernel/printk/printk.c:1897 console_emit_next_record kernel/printk/printk.c:3105 [inline] console_flush_all+0x7aa/0xc60 kernel/printk/printk.c:3199 __console_flush_and_unlock kernel/printk/printk.c:3258 [inline] console_unlock+0xd8/0x210 kernel/printk/printk.c:3298 vprintk_emit+0x3d7/0x680 kernel/printk/printk.c:2423 _printk+0xc7/0x100 kernel/printk/printk.c:2448 fail_dump lib/fault-inject.c:66 [inline] should_fail_ex+0x4e7/0x640 lib/fault-inject.c:174 strncpy_from_user+0x3b/0x2e0 lib/strncpy_from_user.c:118 strncpy_from_user_nofault+0x7f/0x180 mm/maccess.c:192 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:214 [inline] ____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:309 [inline] bpf_probe_read_compat_str+0xe8/0x180 kernel/trace/bpf_trace.c:305 bpf_prog_336c7b50ce4432df+0x8b/0x91 bpf_dispatcher_nop_func include/linux/bpf.h:1350 [inline] __bpf_prog_run include/linux/filter.h:721 [inline] bpf_prog_run include/linux/filter.h:728 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2075 [inline] bpf_trace_run3+0x248/0x5a0 kernel/trace/bpf_trace.c:2117 __bpf_trace_workqueue_queue_work+0x100/0x140 include/trace/events/workqueue.h:23 __do_trace_workqueue_queue_work include/trace/events/workqueue.h:23 [inline] trace_workqueue_queue_work include/trace/events/workqueue.h:23 [inline] __queue_work+0x4fa/0x1160 kernel/workqueue.c:2323 __queue_delayed_work+0x35b/0x460 kernel/workqueue.c:2509 mod_delayed_work_on+0x198/0x1c0 kernel/workqueue.c:2597 kblockd_mod_delayed_work_on+0x29/0x40 block/blk-core.c:1120 scsi_run_queue+0x614/0xc90 drivers/scsi/scsi_lib.c:552 scsi_run_host_queues+0x4c/0x70 drivers/scsi/scsi_lib.c:570 scsi_ioctl_reset+0x438/0x850 drivers/scsi/scsi_error.c:2543 scsi_ioctl+0xfa3/0x1830 drivers/scsi/scsi_ioctl.c:946 sr_block_ioctl+0x202/0x250 drivers/scsi/sr.c:557 blkdev_compat_ptr_ioctl+0x9f/0xe0 block/ioctl.c:313 compat_blkdev_ioctl+0x2ee/0x7a0 block/ioctl.c:761 __do_compat_sys_ioctl fs/ioctl.c:695 [inline] __se_compat_sys_ioctl fs/ioctl.c:638 [inline] __ia32_compat_sys_ioctl+0x23f/0x370 fs/ioctl.c:638 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x7c/0x300 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331 entry_SYSENTER_compat_after_hwframe+0x84/0x8e other info that might help us debug this: Chain exists of: console_owner --> &dev->power.lock --> &pool->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&pool->lock); lock(&dev->power.lock); lock(&pool->lock); lock(console_owner); *** DEADLOCK *** 6 locks held by syz.1.962/10182: #0: ffff8880277fd110 (&cd->lock){+.+.}-{4:4}, at: sr_block_ioctl+0x118/0x250 drivers/scsi/sr.c:543 #1: ffffffff8e3c4320 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #1: ffffffff8e3c4320 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline] #1: ffffffff8e3c4320 (rcu_read_lock){....}-{1:3}, at: __queue_work+0xe7/0x1160 kernel/workqueue.c:2261 #2: ffff88802b239820 (&pool->lock){-.-.}-{2:2}, at: __queue_work+0x6c9/0x1160 kernel/workqueue.c:2298 #3: ffffffff8e3c4320 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #3: ffffffff8e3c4320 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline] #3: ffffffff8e3c4320 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2074 [inline] #3: ffffffff8e3c4320 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run3+0x1cb/0x5a0 kernel/trace/bpf_trace.c:2117 #4: ffffffff8e3b1980 (console_lock){+.+.}-{0:0}, at: _printk+0xc7/0x100 kernel/printk/printk.c:2448 #5: ffffffff8e3b19f0 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:336 [inline] #5: ffffffff8e3b19f0 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:335 [inline] #5: ffffffff8e3b19f0 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:289 [inline] #5: ffffffff8e3b19f0 (console_srcu){....}-{0:0}, at: console_flush_all+0x158/0xc60 kernel/printk/printk.c:3176 stack backtrace: CPU: 0 UID: 0 PID: 10182 Comm: syz.1.962 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2043 check_noncircular+0x14c/0x170 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x12a6/0x1ce0 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825 console_lock_spinning_enable+0x72/0x80 kernel/printk/printk.c:1897 console_emit_next_record kernel/printk/printk.c:3105 [inline] console_flush_all+0x7aa/0xc60 kernel/printk/printk.c:3199 __console_flush_and_unlock kernel/printk/printk.c:3258 [inline] console_unlock+0xd8/0x210 kernel/printk/printk.c:3298 vprintk_emit+0x3d7/0x680 kernel/printk/printk.c:2423 _printk+0xc7/0x100 kernel/printk/printk.c:2448 fail_dump lib/fault-inject.c:66 [inline] should_fail_ex+0x4e7/0x640 lib/fault-inject.c:174 strncpy_from_user+0x3b/0x2e0 lib/strncpy_from_user.c:118 strncpy_from_user_nofault+0x7f/0x180 mm/maccess.c:192 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:214 [inline] ____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:309 [inline] bpf_probe_read_compat_str+0xe8/0x180 kernel/trace/bpf_trace.c:305 bpf_prog_336c7b50ce4432df+0x8b/0x91 bpf_dispatcher_nop_func include/linux/bpf.h:1350 [inline] __bpf_prog_run include/linux/filter.h:721 [inline] bpf_prog_run include/linux/filter.h:728 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2075 [inline] bpf_trace_run3+0x248/0x5a0 kernel/trace/bpf_trace.c:2117 __bpf_trace_workqueue_queue_work+0x100/0x140 include/trace/events/workqueue.h:23 __do_trace_workqueue_queue_work include/trace/events/workqueue.h:23 [inline] trace_workqueue_queue_work include/trace/events/workqueue.h:23 [inline] __queue_work+0x4fa/0x1160 kernel/workqueue.c:2323 __queue_delayed_work+0x35b/0x460 kernel/workqueue.c:2509 mod_delayed_work_on+0x198/0x1c0 kernel/workqueue.c:2597 kblockd_mod_delayed_work_on+0x29/0x40 block/blk-core.c:1120 scsi_run_queue+0x614/0xc90 drivers/scsi/scsi_lib.c:552 scsi_run_host_queues+0x4c/0x70 drivers/scsi/scsi_lib.c:570 scsi_ioctl_reset+0x438/0x850 drivers/scsi/scsi_error.c:2543 scsi_ioctl+0xfa3/0x1830 drivers/scsi/scsi_ioctl.c:946 sr_block_ioctl+0x202/0x250 drivers/scsi/sr.c:557 blkdev_compat_ptr_ioctl+0x9f/0xe0 block/ioctl.c:313 compat_blkdev_ioctl+0x2ee/0x7a0 block/ioctl.c:761 __do_compat_sys_ioctl fs/ioctl.c:695 [inline] __se_compat_sys_ioctl fs/ioctl.c:638 [inline] __ia32_compat_sys_ioctl+0x23f/0x370 fs/ioctl.c:638 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x7c/0x300 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7fd7579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f54c655c EFLAGS: 00000296 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000002284 RDX: 00000000800000c0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 CPU: 0 UID: 0 PID: 10182 Comm: syz.1.962 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 fail_dump lib/fault-inject.c:73 [inline] should_fail_ex+0x512/0x640 lib/fault-inject.c:174 strncpy_from_user+0x3b/0x2e0 lib/strncpy_from_user.c:118 strncpy_from_user_nofault+0x7f/0x180 mm/maccess.c:192 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:214 [inline] ____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:309 [inline] bpf_probe_read_compat_str+0xe8/0x180 kernel/trace/bpf_trace.c:305 bpf_prog_336c7b50ce4432df+0x8b/0x91 bpf_dispatcher_nop_func include/linux/bpf.h:1350 [inline] __bpf_prog_run include/linux/filter.h:721 [inline] bpf_prog_run include/linux/filter.h:728 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2075 [inline] bpf_trace_run3+0x248/0x5a0 kernel/trace/bpf_trace.c:2117 __bpf_trace_workqueue_queue_work+0x100/0x140 include/trace/events/workqueue.h:23 __do_trace_workqueue_queue_work include/trace/events/workqueue.h:23 [inline] trace_workqueue_queue_work include/trace/events/workqueue.h:23 [inline] __queue_work+0x4fa/0x1160 kernel/workqueue.c:2323 __queue_delayed_work+0x35b/0x460 kernel/workqueue.c:2509 mod_delayed_work_on+0x198/0x1c0 kernel/workqueue.c:2597 kblockd_mod_delayed_work_on+0x29/0x40 block/blk-core.c:1120 scsi_run_queue+0x614/0xc90 drivers/scsi/scsi_lib.c:552 scsi_run_host_queues+0x4c/0x70 drivers/scsi/scsi_lib.c:570 scsi_ioctl_reset+0x438/0x850 drivers/scsi/scsi_error.c:2543 scsi_ioctl+0xfa3/0x1830 drivers/scsi/scsi_ioctl.c:946 sr_block_ioctl+0x202/0x250 drivers/scsi/sr.c:557 blkdev_compat_ptr_ioctl+0x9f/0xe0 block/ioctl.c:313 compat_blkdev_ioctl+0x2ee/0x7a0 block/ioctl.c:761 __do_compat_sys_ioctl fs/ioctl.c:695 [inline] __se_compat_sys_ioctl fs/ioctl.c:638 [inline] __ia32_compat_sys_ioctl+0x23f/0x370 fs/ioctl.c:638 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x7c/0x300 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7fd7579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f54c655c EFLAGS: 00000296 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000002284 RDX: 00000000800000c0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi