should_failslab+0x5/0x10 mm/slab_common.c:1304 slab_pre_alloc_hook mm/slab.h:716 [inline] slab_alloc_node mm/slub.c:3144 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc+0x5b/0x480 mm/slub.c:3243 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 ====================================================== WARNING: possible circular locking dependency detected 5.16.0-rc6-next-20211224 #1 Not tainted ------------------------------------------------------ syz-executor.5/7970 is trying to acquire lock: ffffffff85114c60 (console_owner){-.-.}-{0:0}, at: console_trylock_spinning kernel/printk/printk.c:1854 [inline] ffffffff85114c60 (console_owner){-.-.}-{0:0}, at: vprintk_emit+0x29b/0x450 kernel/printk/printk.c:2247 but task is already holding lock: ffff88801a792158 (&port->lock){-.-.}-{2:2}, at: pty_write+0xea/0x1e0 drivers/tty/pty.c:120 mem_pool_alloc mm/kmemleak.c:430 [inline] create_object.isra.0+0x3a/0xa20 mm/kmemleak.c:586 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&port->lock){-.-.}-{2:2} : __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline] slab_post_alloc_hook mm/slab.h:744 [inline] slab_alloc_node mm/slub.c:3230 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc+0x239/0x480 mm/slub.c:3243 tty_port_tty_get+0x1f/0x100 drivers/tty/tty_port.c:305 tty_port_default_wakeup+0x11/0x40 drivers/tty/tty_port.c:48 serial8250_tx_chars+0x50b/0xb00 drivers/tty/serial/8250/8250_port.c:1845 shmem_alloc_inode+0x18/0x40 mm/shmem.c:3724 serial8250_handle_irq.part.0+0x3f1/0x4c0 drivers/tty/serial/8250/8250_port.c:1932 serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1905 [inline] serial8250_default_handle_irq+0xb8/0x230 drivers/tty/serial/8250/8250_port.c:1949 alloc_inode+0x63/0x230 fs/inode.c:260 serial8250_interrupt+0xf4/0x1a0 drivers/tty/serial/8250/8250_core.c:126 new_inode_pseudo fs/inode.c:1018 [inline] new_inode+0x23/0x240 fs/inode.c:1047 __handle_irq_event_percpu+0x20f/0x820 kernel/irq/handle.c:158 shmem_get_inode+0x18b/0xcb0 mm/shmem.c:2269 handle_irq_event_percpu kernel/irq/handle.c:193 [inline] handle_irq_event+0xa7/0x1e0 kernel/irq/handle.c:210 handle_edge_irq+0x262/0xd10 kernel/irq/chip.c:820 __shmem_file_setup mm/shmem.c:4067 [inline] __shmem_file_setup+0xb8/0x310 mm/shmem.c:4052 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline] handle_irq arch/x86/kernel/irq.c:231 [inline] __common_interrupt+0x92/0x1d0 arch/x86/kernel/irq.c:250 common_interrupt+0x9f/0xc0 arch/x86/kernel/irq.c:240 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:629 __do_sys_memfd_create+0x1c6/0x4f0 mm/memfd.c:305 native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] default_idle+0xb/0x10 arch/x86/kernel/process.c:733 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80 default_idle_call+0x87/0xd0 kernel/sched/idle.c:112 entry_SYSCALL_64_after_hwframe+0x44/0xae cpuidle_idle_call kernel/sched/idle.c:194 [inline] do_idle+0x3b9/0x530 kernel/sched/idle.c:306 RIP: 0033:0x7fdce1176b19 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:403 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 RSP: 002b:00007fdcde6ebf48 EFLAGS: 00000246 secondary_startup_64_no_verify+0xd5/0xdb ORIG_RAX: 000000000000013f -> #1 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007fdce1176b19 (&port_lock_key){-.-.}-{2:2} RDX: 0000000000004200 RSI: 0000000000000000 RDI: 00007fdce11d00fb : RBP: 0000000000000004 R08: 0000000000002100 R09: ffffffffffffffff __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 R10: 0000000000000004 R11: 0000000000000246 R12: 0000000008100000 R13: 0000000020000100 R14: 0000000008100000 R15: 0000000020000140 serial8250_console_write+0x90e/0xb20 drivers/tty/serial/8250/8250_port.c:3351 call_console_drivers kernel/printk/printk.c:1932 [inline] console_unlock+0x756/0xae0 kernel/printk/printk.c:2714 register_console kernel/printk/printk.c:3057 [inline] register_console+0x378/0x7d0 kernel/printk/printk.c:2948 univ8250_console_init+0x3a/0x46 drivers/tty/serial/8250/8250_core.c:680 console_init+0x3c9/0x599 kernel/printk/printk.c:3167 start_kernel+0x301/0x4a5 init/main.c:1070 secondary_startup_64_no_verify+0xd5/0xdb -> #0 (console_owner){-.-.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3063 [inline] check_prevs_add kernel/locking/lockdep.c:3186 [inline] validate_chain kernel/locking/lockdep.c:3801 [inline] __lock_acquire+0x2a14/0x5b70 kernel/locking/lockdep.c:5027 lock_acquire kernel/locking/lockdep.c:5639 [inline] lock_acquire+0x1a2/0x4d0 kernel/locking/lockdep.c:5604 console_trylock_spinning kernel/printk/printk.c:1875 [inline] vprintk_emit+0x2d8/0x450 kernel/printk/printk.c:2247 vprintk+0x80/0x90 kernel/printk/printk_safe.c:50 _printk+0xba/0xed kernel/printk/printk.c:2269 fail_dump lib/fault-inject.c:45 [inline] should_fail+0x472/0x5a0 lib/fault-inject.c:146 should_failslab+0x5/0x10 mm/slab_common.c:1304 slab_pre_alloc_hook mm/slab.h:716 [inline] slab_alloc_node mm/slub.c:3144 [inline] slab_alloc mm/slub.c:3238 [inline] __kmalloc+0x72/0x440 mm/slub.c:4420 kmalloc include/linux/slab.h:586 [inline] tty_buffer_alloc+0x23f/0x2a0 drivers/tty/tty_buffer.c:178 __tty_buffer_request_room+0x156/0x2a0 drivers/tty/tty_buffer.c:274 tty_insert_flip_string_fixed_flag+0x91/0x250 drivers/tty/tty_buffer.c:321 tty_insert_flip_string include/linux/tty_flip.h:41 [inline] pty_write+0x11c/0x1e0 drivers/tty/pty.c:122 process_output_block drivers/tty/n_tty.c:581 [inline] n_tty_write+0x416/0xfe0 drivers/tty/n_tty.c:2250 do_tty_write drivers/tty/tty_io.c:1027 [inline] file_tty_write.constprop.0+0x529/0x910 drivers/tty/tty_io.c:1098 call_write_iter include/linux/fs.h:2079 [inline] new_sync_write+0x437/0x660 fs/read_write.c:503 vfs_write+0x7d1/0xae0 fs/read_write.c:590 ksys_write+0x12d/0x250 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae other info that might help us debug this: Chain exists of: console_owner --> &port_lock_key --> &port->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&port->lock); lock(&port_lock_key); lock(&port->lock); lock(console_owner); *** DEADLOCK *** 5 locks held by syz-executor.5/7970: #0: ffff88801e85e098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244 #1: ffff88801e85e130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: tty_write_lock drivers/tty/tty_io.c:950 [inline] #1: ffff88801e85e130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: do_tty_write drivers/tty/tty_io.c:973 [inline] #1: ffff88801e85e130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: file_tty_write.constprop.0+0x29f/0x910 drivers/tty/tty_io.c:1098 #2: ffff88801e85e2e8 (&o_tty->termios_rwsem/1){++++}-{3:3}, at: n_tty_write+0x1bf/0xfe0 drivers/tty/n_tty.c:2233 #3: ffffc90011f1a378 (&ldata->output_lock){+.+.}-{3:3}, at: process_output_block drivers/tty/n_tty.c:536 [inline] #3: ffffc90011f1a378 (&ldata->output_lock){+.+.}-{3:3}, at: n_tty_write+0x542/0xfe0 drivers/tty/n_tty.c:2250 #4: ffff88801a792158 (&port->lock){-.-.}-{2:2}, at: pty_write+0xea/0x1e0 drivers/tty/pty.c:120 stack backtrace: CPU: 0 PID: 7970 Comm: syz-executor.5 Not tainted 5.16.0-rc6-next-20211224 #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:88 [inline] dump_stack_lvl+0x8b/0xb3 lib/dump_stack.c:106 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2143 check_prev_add kernel/locking/lockdep.c:3063 [inline] check_prevs_add kernel/locking/lockdep.c:3186 [inline] validate_chain kernel/locking/lockdep.c:3801 [inline] __lock_acquire+0x2a14/0x5b70 kernel/locking/lockdep.c:5027 lock_acquire kernel/locking/lockdep.c:5639 [inline] lock_acquire+0x1a2/0x4d0 kernel/locking/lockdep.c:5604 console_trylock_spinning kernel/printk/printk.c:1875 [inline] vprintk_emit+0x2d8/0x450 kernel/printk/printk.c:2247 vprintk+0x80/0x90 kernel/printk/printk_safe.c:50 _printk+0xba/0xed kernel/printk/printk.c:2269 fail_dump lib/fault-inject.c:45 [inline] should_fail+0x472/0x5a0 lib/fault-inject.c:146 should_failslab+0x5/0x10 mm/slab_common.c:1304 slab_pre_alloc_hook mm/slab.h:716 [inline] slab_alloc_node mm/slub.c:3144 [inline] slab_alloc mm/slub.c:3238 [inline] __kmalloc+0x72/0x440 mm/slub.c:4420 kmalloc include/linux/slab.h:586 [inline] tty_buffer_alloc+0x23f/0x2a0 drivers/tty/tty_buffer.c:178 __tty_buffer_request_room+0x156/0x2a0 drivers/tty/tty_buffer.c:274 tty_insert_flip_string_fixed_flag+0x91/0x250 drivers/tty/tty_buffer.c:321 tty_insert_flip_string include/linux/tty_flip.h:41 [inline] pty_write+0x11c/0x1e0 drivers/tty/pty.c:122 process_output_block drivers/tty/n_tty.c:581 [inline] n_tty_write+0x416/0xfe0 drivers/tty/n_tty.c:2250 do_tty_write drivers/tty/tty_io.c:1027 [inline] file_tty_write.constprop.0+0x529/0x910 drivers/tty/tty_io.c:1098 call_write_iter include/linux/fs.h:2079 [inline] new_sync_write+0x437/0x660 fs/read_write.c:503 vfs_write+0x7d1/0xae0 fs/read_write.c:590 ksys_write+0x12d/0x250 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f396a025b19 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 RSP: 002b:00007f396759b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f396a138f60 RCX: 00007f396a025b19 RDX: 0000000000000758 RSI: 0000000020000880 RDI: 0000000000000004 RBP: 00007f396759b1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffd07372ddf R14: 00007f396759b300 R15: 0000000000022000 CPU: 0 PID: 7970 Comm: syz-executor.5 Not tainted 5.16.0-rc6-next-20211224 #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:88 [inline] dump_stack_lvl+0x8b/0xb3 lib/dump_stack.c:106 fail_dump lib/fault-inject.c:52 [inline] should_fail.cold+0x5/0xa lib/fault-inject.c:146 should_failslab+0x5/0x10 mm/slab_common.c:1304 slab_pre_alloc_hook mm/slab.h:716 [inline] slab_alloc_node mm/slub.c:3144 [inline] slab_alloc mm/slub.c:3238 [inline] __kmalloc+0x72/0x440 mm/slub.c:4420 kmalloc include/linux/slab.h:586 [inline] tty_buffer_alloc+0x23f/0x2a0 drivers/tty/tty_buffer.c:178 __tty_buffer_request_room+0x156/0x2a0 drivers/tty/tty_buffer.c:274 tty_insert_flip_string_fixed_flag+0x91/0x250 drivers/tty/tty_buffer.c:321 tty_insert_flip_string include/linux/tty_flip.h:41 [inline] pty_write+0x11c/0x1e0 drivers/tty/pty.c:122 process_output_block drivers/tty/n_tty.c:581 [inline] n_tty_write+0x416/0xfe0 drivers/tty/n_tty.c:2250 do_tty_write drivers/tty/tty_io.c:1027 [inline] file_tty_write.constprop.0+0x529/0x910 drivers/tty/tty_io.c:1098 call_write_iter include/linux/fs.h:2079 [inline] new_sync_write+0x437/0x660 fs/read_write.c:503 vfs_write+0x7d1/0xae0 fs/read_write.c:590 ksys_write+0x12d/0x250 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f396a025b19 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 RSP: 002b:00007f396759b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f396a138f60 RCX: 00007f396a025b19 RDX: 0000000000000758 RSI: 0000000020000880 RDI: 0000000000000004 RBP: 00007f396759b1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffd07372ddf R14: 00007f396759b300 R15: 0000000000022000 loop7: detected capacity change from 0 to 264192 EXT4-fs (loop7): mounting ext2 file system using the ext4 subsystem loop6: detected capacity change from 0 to 264192 EXT4-fs: Ignoring removed oldalloc option ext3: Unknown parameter 'measure' EXT4-fs (loop7): mounted filesystem without journal. Quota mode: writeback. loop6: detected capacity change from 0 to 264192 EXT4-fs: Ignoring removed oldalloc option ext3: Unknown parameter 'measure' I/O error, dev loop6, sector 264064 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: ff c3 inc %ebx 2: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 9: 00 00 00 c: 0f 1f 40 00 nopl 0x0(%rax) 10: 48 89 f8 mov %rdi,%rax 13: 48 89 f7 mov %rsi,%rdi 16: 48 89 d6 mov %rdx,%rsi 19: 48 89 ca mov %rcx,%rdx 1c: 4d 89 c2 mov %r8,%r10 1f: 4d 89 c8 mov %r9,%r8 22: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9 27: 0f 05 syscall * 29: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction 2f: 73 01 jae 0x32 31: c3 retq 32: 48 c7 c1 bc ff ff ff mov $0xffffffffffffffbc,%rcx 39: f7 d8 neg %eax 3b: 64 89 01 mov %eax,%fs:(%rcx) 3e: 48 rex.W