loop0: detected capacity change from 0 to 32768 ======================================================= WARNING: The mand mount option has been deprecated and and is ignored by this kernel. Remove the mand option from the mount to silence this warning. ======================================================= XFS (loop0): Mounting V5 Filesystem bfdc47fc-10d8-4eed-a562-11a831b3f791 XFS (loop0): Ending clean mount XFS (loop0): Quotacheck needed: Please wait. XFS (loop0): Quotacheck: Done. loop0: detected capacity change from 32768 to 32767 ====================================================== WARNING: possible circular locking dependency detected 6.12.0-syzkaller-07834-g06afb0f36106 #0 Not tainted ------------------------------------------------------ syz.0.0/5330 is trying to acquire lock: ffffffff8ea3ee80 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:318 [inline] ffffffff8ea3ee80 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slub.c:4036 [inline] ffffffff8ea3ee80 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:4114 [inline] ffffffff8ea3ee80 (fs_reclaim){+.+.}-{0:0}, at: __kmalloc_cache_noprof+0x3d/0x2c0 mm/slub.c:4290 but task is already holding lock: ffff888034591e00 (&q->q_usage_counter(io)#17){++++}-{0:0}, at: loop_set_status+0x1e4/0x8f0 drivers/block/loop.c:1267 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&q->q_usage_counter(io)#17){++++}-{0:0}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 bio_queue_enter block/blk.h:75 [inline] blk_mq_submit_bio+0x1536/0x23a0 block/blk-mq.c:3092 __submit_bio+0x2c6/0x560 block/blk-core.c:629 __submit_bio_noacct_mq block/blk-core.c:710 [inline] submit_bio_noacct_nocheck+0x4d3/0xe30 block/blk-core.c:739 xlog_state_release_iclog+0x41d/0x7b0 fs/xfs/xfs_log.c:567 xlog_force_iclog fs/xfs/xfs_log.c:802 [inline] xlog_force_and_check_iclog fs/xfs/xfs_log.c:2866 [inline] xfs_log_force+0x616/0x960 fs/xfs/xfs_log.c:2943 xfs_qm_dqunpin_wait+0xf2/0x300 fs/xfs/xfs_dquot_item.c:115 xfs_qm_dqflush+0x1ab/0x15e0 fs/xfs/xfs_dquot.c:1268 xfs_qm_dquot_isolate+0xa89/0x13f0 fs/xfs/xfs_qm.c:494 __list_lru_walk_one+0x236/0x660 mm/list_lru.c:234 list_lru_walk_one+0xa6/0xe0 mm/list_lru.c:282 list_lru_shrink_walk include/linux/list_lru.h:228 [inline] xfs_qm_shrink_scan+0x1e1/0x400 fs/xfs/xfs_qm.c:548 do_shrink_slab+0x701/0x1160 mm/shrinker.c:437 shrink_slab+0x1093/0x14d0 mm/shrinker.c:664 shrink_one+0x43b/0x850 mm/vmscan.c:4824 shrink_many mm/vmscan.c:4885 [inline] lru_gen_shrink_node mm/vmscan.c:4963 [inline] shrink_node+0x3789/0x3e10 mm/vmscan.c:5943 kswapd_shrink_node mm/vmscan.c:6771 [inline] balance_pgdat mm/vmscan.c:6963 [inline] kswapd+0x1ca9/0x3700 mm/vmscan.c:7232 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #0 (fs_reclaim){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 __fs_reclaim_acquire mm/page_alloc.c:3851 [inline] fs_reclaim_acquire+0x88/0x130 mm/page_alloc.c:3865 might_alloc include/linux/sched/mm.h:318 [inline] slab_pre_alloc_hook mm/slub.c:4036 [inline] slab_alloc_node mm/slub.c:4114 [inline] __kmalloc_cache_noprof+0x3d/0x2c0 mm/slub.c:4290 kmalloc_noprof include/linux/slab.h:879 [inline] kzalloc_noprof include/linux/slab.h:1015 [inline] kobject_uevent_env+0x28b/0x8e0 lib/kobject_uevent.c:540 set_capacity_and_notify+0x206/0x240 block/genhd.c:95 loop_set_size drivers/block/loop.c:232 [inline] loop_set_status+0x584/0x8f0 drivers/block/loop.c:1285 lo_ioctl+0xcbc/0x1f50 blkdev_ioctl+0x57d/0x6a0 block/ioctl.c:693 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&q->q_usage_counter(io)#17); lock(fs_reclaim); lock(&q->q_usage_counter(io)#17); lock(fs_reclaim); *** DEADLOCK *** 3 locks held by syz.0.0/5330: #0: ffff888034063b60 (&lo->lo_mutex){+.+.}-{4:4}, at: loop_set_status+0x2a/0x8f0 drivers/block/loop.c:1251 #1: ffff888034591e00 (&q->q_usage_counter(io)#17){++++}-{0:0}, at: loop_set_status+0x1e4/0x8f0 drivers/block/loop.c:1267 #2: ffff888034591e38 (&q->q_usage_counter(queue)){+.+.}-{0:0}, at: loop_set_status+0x1e4/0x8f0 drivers/block/loop.c:1267 stack backtrace: CPU: 0 UID: 0 PID: 5330 Comm: syz.0.0 Not tainted 6.12.0-syzkaller-07834-g06afb0f36106 #0 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+0x241/0x360 lib/dump_stack.c:120 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206 check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 __fs_reclaim_acquire mm/page_alloc.c:3851 [inline] fs_reclaim_acquire+0x88/0x130 mm/page_alloc.c:3865 might_alloc include/linux/sched/mm.h:318 [inline] slab_pre_alloc_hook mm/slub.c:4036 [inline] slab_alloc_node mm/slub.c:4114 [inline] __kmalloc_cache_noprof+0x3d/0x2c0 mm/slub.c:4290 kmalloc_noprof include/linux/slab.h:879 [inline] kzalloc_noprof include/linux/slab.h:1015 [inline] kobject_uevent_env+0x28b/0x8e0 lib/kobject_uevent.c:540 set_capacity_and_notify+0x206/0x240 block/genhd.c:95 loop_set_size drivers/block/loop.c:232 [inline] loop_set_status+0x584/0x8f0 drivers/block/loop.c:1285 lo_ioctl+0xcbc/0x1f50 blkdev_ioctl+0x57d/0x6a0 block/ioctl.c:693 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fba0277e819 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fba03514038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fba02935fa0 RCX: 00007fba0277e819 RDX: 00000000200000c0 RSI: 0000000000004c02 RDI: 0000000000000008 RBP: 00007fba027f175e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fba02935fa0 R15: 00007fff7e71afc8