===================================================== WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected 5.10.45 #1 Not tainted ----------------------------------------------------- syz-executor.2/7519 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire: ffff8880186e6b40 (&new->fa_lock){.+.+}-{2:2}, at: kill_fasync_rcu fs/fcntl.c:1004 [inline] ffff8880186e6b40 (&new->fa_lock){.+.+}-{2:2}, at: kill_fasync fs/fcntl.c:1025 [inline] ffff8880186e6b40 (&new->fa_lock){.+.+}-{2:2}, at: kill_fasync+0x14d/0x470 fs/fcntl.c:1018 and this task is already holding: ffff88806ce31340 (batched_entropy_u64.lock){-.-.}-{2:2}, at: get_random_u64+0x46/0x1d0 drivers/char/random.c:2200 which would create a new lock dependency: (batched_entropy_u64.lock){-.-.}-{2:2} -> (&new->fa_lock){.+.+}-{2:2} but this new dependency connects a HARDIRQ-irq-safe lock: (batched_entropy_u64.lock){-.-.}-{2:2} ... which became HARDIRQ-irq-safe at: lock_acquire kernel/locking/lockdep.c:5444 [inline] lock_acquire+0x197/0x6c0 kernel/locking/lockdep.c:5409 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x27/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] invalidate_batched_entropy+0xdf/0x1c0 drivers/char/random.c:2253 crng_fast_load+0x243/0x260 drivers/char/random.c:896 add_interrupt_randomness+0x523/0x650 drivers/char/random.c:1283 handle_irq_event_percpu kernel/irq/handle.c:198 [inline] handle_irq_event+0x13f/0x290 kernel/irq/handle.c:213 handle_edge_irq+0x249/0xd00 kernel/irq/chip.c:819 asm_call_irq_on_stack+0x12/0x20 __run_irq_on_irqstack arch/x86/include/asm/irq_stack.h:48 [inline] run_irq_on_irqstack_cond arch/x86/include/asm/irq_stack.h:101 [inline] handle_irq arch/x86/kernel/irq.c:230 [inline] __common_interrupt arch/x86/kernel/irq.c:249 [inline] common_interrupt+0xe6/0x190 arch/x86/kernel/irq.c:239 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:635 native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline] arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline] default_idle+0xe/0x10 arch/x86/kernel/process.c:688 default_idle_call+0x87/0xd0 kernel/sched/idle.c:112 cpuidle_idle_call kernel/sched/idle.c:194 [inline] do_idle+0x3a9/0x520 kernel/sched/idle.c:300 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:396 start_kernel+0x481/0x4a2 init/main.c:1061 secondary_startup_64_no_verify+0xc2/0xcb to a HARDIRQ-irq-unsafe lock: (&new->fa_lock){.+.+}-{2:2} ... which became HARDIRQ-irq-unsafe at: ... lock_acquire kernel/locking/lockdep.c:5444 [inline] lock_acquire+0x197/0x6c0 kernel/locking/lockdep.c:5409 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x58/0x70 kernel/locking/spinlock.c:223 kill_fasync_rcu fs/fcntl.c:1004 [inline] kill_fasync fs/fcntl.c:1025 [inline] kill_fasync+0x14d/0x470 fs/fcntl.c:1018 pipe_write+0xf18/0x19d0 fs/pipe.c:581 call_write_iter include/linux/fs.h:1903 [inline] new_sync_write+0x42c/0x660 fs/read_write.c:518 vfs_write+0x77f/0xa20 fs/read_write.c:605 ksys_write+0x1ee/0x250 fs/read_write.c:658 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 0 entry_SYSCALL_64_after_hwframe+0x44/0xa9 other info that might help us debug this: Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&new->fa_lock); CPU: 1 PID: 7526 Comm: syz-executor.4 Not tainted 5.10.45 #1 local_irq_disable(); Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 lock( Call Trace: batched_entropy_u64.lock __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:118 ); fail_dump lib/fault-inject.c:52 [inline] should_fail.cold+0x5/0xa lib/fault-inject.c:146 lock( strncpy_from_user+0x34/0x460 lib/strncpy_from_user.c:118 &new->fa_lock getxattr+0x89/0x2e0 fs/xattr.c:621 ); lock( batched_entropy_u64.lock ); *** DEADLOCK *** 2 locks held by syz-executor.2/7519: #0: ffff88806ce31340 __do_sys_fgetxattr fs/xattr.c:693 [inline] __se_sys_fgetxattr fs/xattr.c:684 [inline] __x64_sys_fgetxattr+0x176/0x210 fs/xattr.c:684 ( do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 batched_entropy_u64.lock entry_SYSCALL_64_after_hwframe+0x44/0xa9 ){-.-.}-{2:2} RIP: 0033:0x466609 , at: get_random_u64+0x46/0x1d0 drivers/char/random.c:2200 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 #1: RSP: 002b:00007f30e5f13188 EFLAGS: 00000246 ffffffff84df64a0 ORIG_RAX: 00000000000000c1 ( RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 0000000000466609 rcu_read_lock RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 ){....}-{1:2} RBP: 00007f30e5f131d0 R08: 0000000000000000 R09: 0000000000000000 , at: kill_fasync+0x3d/0x470 fs/fcntl.c:1023 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 the dependencies between HARDIRQ-irq-safe lock and the holding lock: R13: 00007ffe31ae6a3f R14: 00007f30e5f13300 R15: 0000000000022000 -> (batched_entropy_u64.lock){-.-.}-{2:2} { IN-HARDIRQ-W at: lock_acquire kernel/locking/lockdep.c:5444 [inline] lock_acquire+0x197/0x6c0 kernel/locking/lockdep.c:5409 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x27/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] invalidate_batched_entropy+0xdf/0x1c0 drivers/char/random.c:2253 crng_fast_load+0x243/0x260 drivers/char/random.c:896 add_interrupt_randomness+0x523/0x650 drivers/char/random.c:1283 handle_irq_event_percpu kernel/irq/handle.c:198 [inline] handle_irq_event+0x13f/0x290 kernel/irq/handle.c:213 handle_edge_irq+0x249/0xd00 kernel/irq/chip.c:819 asm_call_irq_on_stack+0x12/0x20 __run_irq_on_irqstack arch/x86/include/asm/irq_stack.h:48 [inline] run_irq_on_irqstack_cond arch/x86/include/asm/irq_stack.h:101 [inline] handle_irq arch/x86/kernel/irq.c:230 [inline] __common_interrupt arch/x86/kernel/irq.c:249 [inline] common_interrupt+0xe6/0x190 arch/x86/kernel/irq.c:239 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:635 native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline] arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline] default_idle+0xe/0x10 arch/x86/kernel/process.c:688 default_idle_call+0x87/0xd0 kernel/sched/idle.c:112 cpuidle_idle_call kernel/sched/idle.c:194 [inline] do_idle+0x3a9/0x520 kernel/sched/idle.c:300 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:396 start_kernel+0x481/0x4a2 init/main.c:1061 secondary_startup_64_no_verify+0xc2/0xcb IN-SOFTIRQ-W at: lock_acquire kernel/locking/lockdep.c:5444 [inline] lock_acquire+0x197/0x6c0 kernel/locking/lockdep.c:5409 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x27/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] invalidate_batched_entropy+0xdf/0x1c0 drivers/char/random.c:2253 crng_reseed+0x848/0xcf0 drivers/char/random.c:978 credit_entropy_bits.constprop.0+0x315/0x3d0 drivers/char/random.c:734 add_timer_randomness+0x1c6/0x240 drivers/char/random.c:1198 add_disk_randomness+0xbc/0x310 drivers/char/random.c:1327 scsi_end_request+0x650/0x830 drivers/scsi/scsi_lib.c:574 scsi_io_completion+0x194/0x12c0 drivers/scsi/scsi_lib.c:966 scsi_softirq_done+0x11b/0x490 drivers/scsi/scsi_lib.c:1446 blk_done_softirq+0x22f/0x360 block/blk-mq.c:586 __do_softirq+0x1b8/0x85f kernel/softirq.c:298 asm_call_irq_on_stack+0x12/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x80/0xa0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x110/0x1a0 kernel/softirq.c:435 common_interrupt+0xaa/0x190 arch/x86/kernel/irq.c:239 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:635 native_restore_fl arch/x86/include/asm/irqflags.h:41 [inline] arch_local_irq_restore arch/x86/include/asm/irqflags.h:84 [inline] lock_is_held_type+0xd0/0x100 kernel/locking/lockdep.c:5485 lock_is_held include/linux/lockdep.h:271 [inline] ___might_sleep+0x204/0x2b0 kernel/sched/core.c:7263 down_write+0x6e/0x150 kernel/locking/rwsem.c:1556 i_mmap_lock_write include/linux/fs.h:493 [inline] unlink_file_vma+0x86/0x1c0 mm/mmap.c:165 free_pgtables+0x1b3/0x2f0 mm/memory.c:416 exit_mmap+0x28e/0x4e0 mm/mmap.c:3221 __mmput kernel/fork.c:1088 [inline] mmput+0xca/0x340 kernel/fork.c:1109 exec_mmap fs/exec.c:1030 [inline] begin_new_exec+0xdc1/0x2a20 fs/exec.c:1276 load_elf_binary+0x15e7/0x4c70 fs/binfmt_elf.c:998 search_binary_handler fs/exec.c:1703 [inline] exec_binprm fs/exec.c:1744 [inline] bprm_execve+0x9ef/0x1b00 fs/exec.c:1820 do_execveat_common+0x626/0x7c0 fs/exec.c:1915 do_execve fs/exec.c:1983 [inline] __do_sys_execve fs/exec.c:2059 [inline] __se_sys_execve fs/exec.c:2054 [inline] __x64_sys_execve+0x8f/0xc0 fs/exec.c:2054 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5444 [inline] lock_acquire+0x197/0x6c0 kernel/locking/lockdep.c:5409 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x36/0x50 kernel/locking/spinlock.c:159 get_random_u64+0x46/0x1d0 drivers/char/random.c:2200 get_random_long include/linux/random.h:61 [inline] get_random_canary include/linux/random.h:83 [inline] dup_task_struct kernel/fork.c:911 [inline] copy_process+0x7f4/0x6640 kernel/fork.c:1947 kernel_clone+0xe7/0xa20 kernel/fork.c:2465 kernel_thread+0xb5/0xf0 kernel/fork.c:2517 rest_init+0x23/0x371 init/main.c:687 start_kernel+0x481/0x4a2 init/main.c:1061 secondary_startup_64_no_verify+0xc2/0xcb } ... key at: [] 0xffff88806ce31340 ... acquired at: lock_acquire kernel/locking/lockdep.c:5444 [inline] lock_acquire+0x197/0x6c0 kernel/locking/lockdep.c:5409 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x58/0x70 kernel/locking/spinlock.c:223 kill_fasync_rcu fs/fcntl.c:1004 [inline] kill_fasync fs/fcntl.c:1025 [inline] kill_fasync+0x14d/0x470 fs/fcntl.c:1018 account drivers/char/random.c:1381 [inline] extract_entropy drivers/char/random.c:1508 [inline] crng_reseed+0xb12/0xcf0 drivers/char/random.c:958 _extract_crng+0x1e6/0x250 drivers/char/random.c:1006 crng_reseed+0x776/0xcf0 drivers/char/random.c:962 _extract_crng+0x1e6/0x250 drivers/char/random.c:1006 extract_crng drivers/char/random.c:1026 [inline] get_random_u64+0x159/0x1d0 drivers/char/random.c:2202 get_random_long include/linux/random.h:61 [inline] get_random_canary include/linux/random.h:83 [inline] dup_task_struct kernel/fork.c:911 [inline] copy_process+0x7f4/0x6640 kernel/fork.c:1947 kernel_clone+0xe7/0xa20 kernel/fork.c:2465 __do_sys_clone+0xc8/0x110 kernel/fork.c:2582 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 the dependencies between the lock to be acquired and HARDIRQ-irq-unsafe lock: -> (&new->fa_lock){.+.+}-{2:2} { HARDIRQ-ON-R at: lock_acquire kernel/locking/lockdep.c:5444 [inline] lock_acquire+0x197/0x6c0 kernel/locking/lockdep.c:5409 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x58/0x70 kernel/locking/spinlock.c:223 kill_fasync_rcu fs/fcntl.c:1004 [inline] kill_fasync fs/fcntl.c:1025 [inline] kill_fasync+0x14d/0x470 fs/fcntl.c:1018 pipe_write+0xf18/0x19d0 fs/pipe.c:581 call_write_iter include/linux/fs.h:1903 [inline] new_sync_write+0x42c/0x660 fs/read_write.c:518 vfs_write+0x77f/0xa20 fs/read_write.c:605 ksys_write+0x1ee/0x250 fs/read_write.c:658 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 SOFTIRQ-ON-R at: lock_acquire kernel/locking/lockdep.c:5444 [inline] lock_acquire+0x197/0x6c0 kernel/locking/lockdep.c:5409 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x58/0x70 kernel/locking/spinlock.c:223 kill_fasync_rcu fs/fcntl.c:1004 [inline] kill_fasync fs/fcntl.c:1025 [inline] kill_fasync+0x14d/0x470 fs/fcntl.c:1018 pipe_write+0xf18/0x19d0 fs/pipe.c:581 call_write_iter include/linux/fs.h:1903 [inline] new_sync_write+0x42c/0x660 fs/read_write.c:518 vfs_write+0x77f/0xa20 fs/read_write.c:605 ksys_write+0x1ee/0x250 fs/read_write.c:658 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5444 [inline] lock_acquire+0x197/0x6c0 kernel/locking/lockdep.c:5409 __raw_write_lock_irq include/linux/rwlock_api_smp.h:196 [inline] _raw_write_lock_irq+0x2f/0x40 kernel/locking/spinlock.c:311 fasync_remove_entry+0xb6/0x1f0 fs/fcntl.c:882 fasync_helper+0x9e/0xb0 fs/fcntl.c:985 pipe_fasync+0x128/0x230 fs/pipe.c:730 __fput+0x743/0x980 fs/file_table.c:278 task_work_run+0xe2/0x1a0 kernel/task_work.c:151 exit_task_work include/linux/task_work.h:30 [inline] do_exit+0xc1b/0x2780 kernel/exit.c:811 do_group_exit+0x125/0x310 kernel/exit.c:908 get_signal+0x469/0x2200 kernel/signal.c:2758 arch_do_signal+0x88/0x1a90 arch/x86/kernel/signal.c:789 exit_to_user_mode_loop kernel/entry/common.c:161 [inline] exit_to_user_mode_prepare+0xf7/0x160 kernel/entry/common.c:191 syscall_exit_to_user_mode+0x38/0x230 kernel/entry/common.c:266 ret_from_fork+0x15/0x30 arch/x86/entry/entry_64.S:289 INITIAL READ USE at: lock_acquire kernel/locking/lockdep.c:5444 [inline] lock_acquire+0x197/0x6c0 kernel/locking/lockdep.c:5409 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x58/0x70 kernel/locking/spinlock.c:223 kill_fasync_rcu fs/fcntl.c:1004 [inline] kill_fasync fs/fcntl.c:1025 [inline] kill_fasync+0x14d/0x470 fs/fcntl.c:1018 pipe_write+0xf18/0x19d0 fs/pipe.c:581 call_write_iter include/linux/fs.h:1903 [inline] new_sync_write+0x42c/0x660 fs/read_write.c:518 vfs_write+0x77f/0xa20 fs/read_write.c:605 ksys_write+0x1ee/0x250 fs/read_write.c:658 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 } ... key at: [] __key.0+0x0/0x40 ... acquired at: lock_acquire kernel/locking/lockdep.c:5444 [inline] lock_acquire+0x197/0x6c0 kernel/locking/lockdep.c:5409 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x58/0x70 kernel/locking/spinlock.c:223 kill_fasync_rcu fs/fcntl.c:1004 [inline] kill_fasync fs/fcntl.c:1025 [inline] kill_fasync+0x14d/0x470 fs/fcntl.c:1018 account drivers/char/random.c:1381 [inline] extract_entropy drivers/char/random.c:1508 [inline] crng_reseed+0xb12/0xcf0 drivers/char/random.c:958 _extract_crng+0x1e6/0x250 drivers/char/random.c:1006 crng_reseed+0x776/0xcf0 drivers/char/random.c:962 _extract_crng+0x1e6/0x250 drivers/char/random.c:1006 extract_crng drivers/char/random.c:1026 [inline] get_random_u64+0x159/0x1d0 drivers/char/random.c:2202 get_random_long include/linux/random.h:61 [inline] get_random_canary include/linux/random.h:83 [inline] dup_task_struct kernel/fork.c:911 [inline] copy_process+0x7f4/0x6640 kernel/fork.c:1947 kernel_clone+0xe7/0xa20 kernel/fork.c:2465 __do_sys_clone+0xc8/0x110 kernel/fork.c:2582 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 stack backtrace: CPU: 0 PID: 7519 Comm: syz-executor.2 Not tainted 5.10.45 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:118 print_bad_irq_dependency kernel/locking/lockdep.c:2453 [inline] check_irq_usage.cold+0x481/0x58d kernel/locking/lockdep.c:2682 check_prev_add kernel/locking/lockdep.c:2873 [inline] check_prevs_add kernel/locking/lockdep.c:2994 [inline] validate_chain kernel/locking/lockdep.c:3609 [inline] __lock_acquire+0x2a60/0x5a80 kernel/locking/lockdep.c:4834 lock_acquire kernel/locking/lockdep.c:5444 [inline] lock_acquire+0x197/0x6c0 kernel/locking/lockdep.c:5409 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x58/0x70 kernel/locking/spinlock.c:223 kill_fasync_rcu fs/fcntl.c:1004 [inline] kill_fasync fs/fcntl.c:1025 [inline] kill_fasync+0x14d/0x470 fs/fcntl.c:1018 account drivers/char/random.c:1381 [inline] extract_entropy drivers/char/random.c:1508 [inline] crng_reseed+0xb12/0xcf0 drivers/char/random.c:958 _extract_crng+0x1e6/0x250 drivers/char/random.c:1006 crng_reseed+0x776/0xcf0 drivers/char/random.c:962 _extract_crng+0x1e6/0x250 drivers/char/random.c:1006 extract_crng drivers/char/random.c:1026 [inline] get_random_u64+0x159/0x1d0 drivers/char/random.c:2202 get_random_long include/linux/random.h:61 [inline] get_random_canary include/linux/random.h:83 [inline] dup_task_struct kernel/fork.c:911 [inline] copy_process+0x7f4/0x6640 kernel/fork.c:1947 kernel_clone+0xe7/0xa20 kernel/fork.c:2465 __do_sys_clone+0xc8/0x110 kernel/fork.c:2582 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x467a31 Code: 48 85 ff 74 3d 48 85 f6 74 38 48 83 ee 10 48 89 4e 08 48 89 3e 48 89 d7 4c 89 c2 4d 89 c8 4c 8b 54 24 08 b8 38 00 00 00 0f 05 <48> 85 c0 7c 13 74 01 c3 31 ed 58 5f ff d0 48 89 c7 b8 3c 00 00 00 RSP: 002b:00007ffdb6f34b58 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ffbf0843700 RCX: 0000000000467a31 RDX: 00007ffbf08439d0 RSI: 00007ffbf08432f0 RDI: 00000000003d0f00 RBP: 00007ffdb6f34d90 R08: 00007ffbf0843700 R09: 00007ffbf0843700 R10: 00007ffbf08439d0 R11: 0000000000000206 R12: 00007ffdb6f34c0e R13: 00007ffdb6f34c0f R14: 00007ffbf0843300 R15: 0000000000022000 FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 7552 Comm: syz-executor.4 Not tainted 5.10.45 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:52 [inline] should_fail.cold+0x5/0xa lib/fault-inject.c:146 _copy_to_user+0x2e/0x180 lib/usercopy.c:29 copy_to_user include/linux/uaccess.h:200 [inline] simple_read_from_buffer+0xcc/0x160 fs/libfs.c:729 proc_fail_nth_read+0x194/0x220 fs/proc/base.c:1423 vfs_read+0x228/0x580 fs/read_write.c:494 ksys_read+0x12d/0x250 fs/read_write.c:634 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x41935c Code: ec 28 48 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 fc ff ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 34 44 89 c7 48 89 44 24 08 e8 2f fd ff ff 48 RSP: 002b:00007f30e5f13170 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 000000000041935c RDX: 000000000000000f RSI: 00007f30e5f131e0 RDI: 0000000000000004 RBP: 00007f30e5f131d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffe31ae6a3f R14: 00007f30e5f13300 R15: 0000000000022000