I/O error, dev loop5, sector 18692 op 0x1:(WRITE) flags 0x800 phys_seg 1 prio class 2 loop5: writeback error on inode 9286, offset 0, sector 18692 ================================ WARNING: inconsistent lock state syzkaller #0 Tainted: G L -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. kworker/u8:3/16531 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff888054af5c80 (&sb->s_type->i_lock_key#41){+.?.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] ffff888054af5c80 (&sb->s_type->i_lock_key#41){+.?.}-{3:3}, at: igrab+0x2a/0x230 fs/inode.c:1574 {SOFTIRQ-ON-W} state was registered at: lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x17c/0x330 kernel/locking/lockdep.c:5825 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] unlock_new_inode+0x7a/0x330 fs/inode.c:1213 xfs_finish_inode_setup fs/xfs/xfs_inode.h:630 [inline] xfs_setup_existing_inode fs/xfs/xfs_inode.h:637 [inline] xfs_iget+0x1196/0x30f0 fs/xfs/xfs_icache.c:814 xfs_mountfs+0x108c/0x20b0 fs/xfs/xfs_mount.c:1072 xfs_fs_fill_super+0x153f/0x1f20 fs/xfs/xfs_super.c:1947 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1694 vfs_get_tree+0x92/0x320 fs/super.c:1754 fc_mount fs/namespace.c:1193 [inline] do_new_mount_fc fs/namespace.c:3761 [inline] do_new_mount fs/namespace.c:3837 [inline] path_mount+0x7d0/0x23d0 fs/namespace.c:4147 do_mount fs/namespace.c:4160 [inline] __do_sys_mount fs/namespace.c:4349 [inline] __se_sys_mount fs/namespace.c:4326 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:4326 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f irq event stamp: 534388 hardirqs last enabled at (534388): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (534388): [] _raw_spin_unlock_irqrestore+0x52/0x80 kernel/locking/spinlock.c:194 hardirqs last disabled at (534387): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (534387): [] _raw_spin_lock_irqsave+0x52/0x60 kernel/locking/spinlock.c:162 softirqs last enabled at (534340): [] spin_unlock_bh include/linux/spinlock.h:396 [inline] softirqs last enabled at (534340): [] addrconf_dad_work+0x516/0x1360 net/ipv6/addrconf.c:4224 softirqs last disabled at (534341): [] do_softirq kernel/softirq.c:523 [inline] softirqs last disabled at (534341): [] do_softirq+0xac/0xe0 kernel/softirq.c:510 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&sb->s_type->i_lock_key#41); lock(&sb->s_type->i_lock_key#41); *** DEADLOCK *** 3 locks held by kworker/u8:3/16531: #0: ffff88814c197148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x11ae/0x1840 kernel/workqueue.c:3232 #1: ffffc90003ad7c98 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x927/0x1840 kernel/workqueue.c:3233 #2: ffffffff90400ea8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #2: ffffffff90400ea8 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x11f/0x1360 net/ipv6/addrconf.c:4194 stack backtrace: CPU: 0 UID: 0 PID: 16531 Comm: kworker/u8:3 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 Workqueue: ipv6_addrconf addrconf_dad_work Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_usage_bug.part.0+0x257/0x340 kernel/locking/lockdep.c:4042 print_usage_bug kernel/locking/lockdep.c:4010 [inline] valid_state kernel/locking/lockdep.c:4056 [inline] mark_lock_irq kernel/locking/lockdep.c:4267 [inline] mark_lock+0x74a/0xa20 kernel/locking/lockdep.c:4753 mark_usage kernel/locking/lockdep.c:4642 [inline] __lock_acquire+0x103a/0x2630 kernel/locking/lockdep.c:5191 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x17c/0x330 kernel/locking/lockdep.c:5825 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] igrab+0x2a/0x230 fs/inode.c:1574 fserror_report+0x3fd/0x750 fs/fserror.c:159 fserror_report_io include/linux/fserror.h:48 [inline] iomap_finish_ioend_buffered+0x492/0x710 fs/iomap/ioend.c:60 bio_endio+0x755/0x8b0 block/bio.c:1709 blk_update_request+0x741/0x1330 block/blk-mq.c:1007 blk_mq_end_request+0x5b/0x420 block/blk-mq.c:1169 lo_complete_rq+0x1d4/0x2a0 drivers/block/loop.c:314 blk_complete_reqs+0xb1/0xf0 block/blk-mq.c:1244 handle_softirqs+0x1ea/0x910 kernel/softirq.c:622 do_softirq kernel/softirq.c:523 [inline] do_softirq+0xac/0xe0 kernel/softirq.c:510 __local_bh_enable_ip+0xf8/0x120 kernel/softirq.c:450 spin_unlock_bh include/linux/spinlock.h:396 [inline] addrconf_dad_work+0x516/0x1360 net/ipv6/addrconf.c:4224 process_one_work+0x9c2/0x1840 kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x5da/0xe40 kernel/workqueue.c:3421 kthread+0x3b3/0x730 kernel/kthread.c:463 ret_from_fork+0x754/0xaf0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246