vxfs: WRONG superblock magic 00000000 at 1 vxfs: WRONG superblock magic 00000000 at 8 vxfs: can't find superblock. ====================================================== WARNING: possible circular locking dependency detected 4.14.292-syzkaller #0 Not tainted ------------------------------------------------------ systemd-udevd/10340 is trying to acquire lock: (&(&gsm->tx_lock)->rlock){-...}, at: [] gsmld_write_wakeup+0x4e/0xd0 drivers/tty/n_gsm.c:2490 but task is already holding lock: (&port_lock_key){-.-.}, at: [] serial8250_handle_irq.part.0+0x20/0x330 drivers/tty/serial/8250/8250_port.c:1891 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&port_lock_key){-.-.}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x8c/0xc0 kernel/locking/spinlock.c:160 uart_write_room+0xd5/0x340 drivers/tty/serial/serial_core.c:643 tty_write_room+0x61/0x80 drivers/tty/tty_ioctl.c:78 gsmld_write+0x69/0x120 drivers/tty/n_gsm.c:2546 do_tty_write drivers/tty/tty_io.c:959 [inline] tty_write+0x410/0x740 drivers/tty/tty_io.c:1043 __vfs_write+0xe4/0x630 fs/read_write.c:480 __kernel_write+0xf5/0x330 fs/read_write.c:501 write_pipe_buf+0x143/0x1c0 fs/splice.c:797 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x326/0x7a0 fs/splice.c:626 splice_from_pipe fs/splice.c:661 [inline] default_file_splice_write+0xc5/0x150 fs/splice.c:809 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x115/0x160 fs/splice.c:1016 splice_direct_to_actor+0x25a/0x700 fs/splice.c:971 do_splice_direct+0x164/0x210 fs/splice.c:1059 do_sendfile+0x47f/0xb30 fs/read_write.c:1441 SYSC_sendfile64 fs/read_write.c:1502 [inline] SyS_sendfile64+0xff/0x110 fs/read_write.c:1488 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #0 (&(&gsm->tx_lock)->rlock){-...}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x8c/0xc0 kernel/locking/spinlock.c:160 gsmld_write_wakeup+0x4e/0xd0 drivers/tty/n_gsm.c:2490 tty_wakeup+0xc3/0xf0 drivers/tty/tty_io.c:533 tty_port_default_wakeup+0x26/0x40 drivers/tty/tty_port.c:49 serial8250_tx_chars+0x3fe/0xc70 drivers/tty/serial/8250/8250_port.c:1828 serial8250_handle_irq.part.0+0x28d/0x330 drivers/tty/serial/8250/8250_port.c:1915 serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1888 [inline] serial8250_default_handle_irq+0x8a/0x1f0 drivers/tty/serial/8250/8250_port.c:1931 serial8250_interrupt+0xf3/0x210 drivers/tty/serial/8250/8250_core.c:129 __handle_irq_event_percpu+0xee/0x7f0 kernel/irq/handle.c:147 handle_irq_event_percpu kernel/irq/handle.c:187 [inline] handle_irq_event+0xed/0x240 kernel/irq/handle.c:204 handle_edge_irq+0x224/0xc40 kernel/irq/chip.c:770 generic_handle_irq_desc include/linux/irqdesc.h:159 [inline] handle_irq+0x35/0x50 arch/x86/kernel/irq_64.c:87 do_IRQ+0x93/0x1d0 arch/x86/kernel/irq.c:230 ret_from_intr+0x0/0x1e __read_once_size include/linux/compiler.h:185 [inline] compound_head include/linux/page-flags.h:147 [inline] trylock_page include/linux/pagemap.h:469 [inline] filemap_map_pages+0x6f7/0xe40 mm/filemap.c:2572 do_fault_around+0x1fe/0x620 mm/memory.c:3715 do_read_fault mm/memory.c:3749 [inline] do_fault mm/memory.c:3880 [inline] handle_pte_fault mm/memory.c:4110 [inline] __handle_mm_fault+0x2b1f/0x4620 mm/memory.c:4234 handle_mm_fault+0x455/0x9c0 mm/memory.c:4271 __do_page_fault+0x549/0xad0 arch/x86/mm/fault.c:1442 page_fault+0x45/0x50 arch/x86/entry/entry_64.S:1123 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&port_lock_key); lock(&(&gsm->tx_lock)->rlock); lock(&port_lock_key); lock(&(&gsm->tx_lock)->rlock); *** DEADLOCK *** 6 locks held by systemd-udevd/10340: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x2b9/0xad0 arch/x86/mm/fault.c:1371 #1: (rcu_read_lock){....}, at: [] filemap_map_pages+0xe2/0xe40 mm/filemap.c:2530 #2: (&(ptlock_ptr(page))->rlock#2){+.+.}, at: [] spin_lock include/linux/spinlock.h:317 [inline] #2: (&(ptlock_ptr(page))->rlock#2){+.+.}, at: [] pte_alloc_one_map mm/memory.c:3420 [inline] #2: (&(ptlock_ptr(page))->rlock#2){+.+.}, at: [] alloc_set_pte+0xd57/0x1610 mm/memory.c:3548 #3: (&(&i->lock)->rlock){-.-.}, at: [] spin_lock include/linux/spinlock.h:317 [inline] #3: (&(&i->lock)->rlock){-.-.}, at: [] serial8250_interrupt+0x3a/0x210 drivers/tty/serial/8250/8250_core.c:119 #4: (&port_lock_key){-.-.}, at: [] serial8250_handle_irq.part.0+0x20/0x330 drivers/tty/serial/8250/8250_port.c:1891 #5: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref+0x1b/0x80 drivers/tty/tty_ldisc.c:305 stack backtrace: CPU: 1 PID: 10340 Comm: systemd-udevd Not tainted 4.14.292-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1905 [inline] check_prevs_add kernel/locking/lockdep.c:2022 [inline] validate_chain kernel/locking/lockdep.c:2464 [inline] __lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x8c/0xc0 kernel/locking/spinlock.c:160 gsmld_write_wakeup+0x4e/0xd0 drivers/tty/n_gsm.c:2490 tty_wakeup+0xc3/0xf0 drivers/tty/tty_io.c:533 tty_port_default_wakeup+0x26/0x40 drivers/tty/tty_port.c:49 serial8250_tx_chars+0x3fe/0xc70 drivers/tty/serial/8250/8250_port.c:1828 serial8250_handle_irq.part.0+0x28d/0x330 drivers/tty/serial/8250/8250_port.c:1915 serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1888 [inline] serial8250_default_handle_irq+0x8a/0x1f0 drivers/tty/serial/8250/8250_port.c:1931 serial8250_interrupt+0xf3/0x210 drivers/tty/serial/8250/8250_core.c:129 __handle_irq_event_percpu+0xee/0x7f0 kernel/irq/handle.c:147 handle_irq_event_percpu kernel/irq/handle.c:187 [inline] handle_irq_event+0xed/0x240 kernel/irq/handle.c:204 handle_edge_irq+0x224/0xc40 kernel/irq/chip.c:770 generic_handle_irq_desc include/linux/irqdesc.h:159 [inline] handle_irq+0x35/0x50 arch/x86/kernel/irq_64.c:87 do_IRQ+0x93/0x1d0 arch/x86/kernel/irq.c:230 common_interrupt+0x93/0x93 arch/x86/entry/entry_64.S:576 RIP: 0010:__read_once_size include/linux/compiler.h:185 [inline] RIP: 0010:compound_head include/linux/page-flags.h:147 [inline] RIP: 0010:trylock_page include/linux/pagemap.h:469 [inline] RIP: 0010:filemap_map_pages+0x6f7/0xe40 mm/filemap.c:2572 RSP: 0000:ffff8880574efbb8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffc8 RAX: 1ffffd40005088a4 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffea0002844520 RBP: ffffea0002844500 R08: ffff8880574efdb8 R09: 0000000000000003 R10: 0000000000000000 R11: ffff8880574b2640 R12: ffffea0002844500 R13: ffffea000284451c R14: ffff8880a3fdd850 R15: ffffea00028b2ba0 do_fault_around+0x1fe/0x620 mm/memory.c:3715 do_read_fault mm/memory.c:3749 [inline] do_fault mm/memory.c:3880 [inline] handle_pte_fault mm/memory.c:4110 [inline] __handle_mm_fault+0x2b1f/0x4620 mm/memory.c:4234 handle_mm_fault+0x455/0x9c0 mm/memory.c:4271 __do_page_fault+0x549/0xad0 arch/x86/mm/fault.c:1442 page_fault+0x45/0x50 arch/x86/entry/entry_64.S:1123 RIP: 43636740:0x555943618010 RSP: 4361e1c0:000000000000285f EFLAGS: 0000285f ntfs: (device loop3): is_boot_sector_ntfs(): Invalid boot sector checksum. ntfs: (device loop3): read_ntfs_boot_sector(): Primary boot sector is invalid. ntfs: (device loop3): read_ntfs_boot_sector(): Mount option errors=recover not used. Aborting without trying to recover. ntfs: (device loop3): ntfs_fill_super(): Not an NTFS volume. unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1