gfs2: fsid=syz:syz.0: first mount done, others may mount BUG: Dentry 00000000923cd2e1{i=925,n=/} still in use (3) [unmount of gfs2 loop3] ------------[ cut here ]------------ WARNING: CPU: 1 PID: 4520 at fs/dcache.c:1681 umount_check+0x180/0x1bc fs/dcache.c:1672 Modules linked in: CPU: 1 PID: 4520 Comm: syz.3.20 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : umount_check+0x180/0x1bc fs/dcache.c:1672 lr : umount_check+0x180/0x1bc fs/dcache.c:1672 sp : ffff8000230677a0 x29: ffff8000230677a0 x28: ffff0000cf5ce468 x27: ffff800023067a40 x26: dfff800000000000 x25: dfff800000000000 x24: ffff0000d8f7c000 x23: dfff800000000000 x22: ffff8000157fe9a0 x21: 0000000000000003 x20: 0000000000000925 x19: ffff0000cf5ce468 x18: 0000000000000000 x17: 756f6d6e755b2029 x16: ffff8000082d22e0 x15: 0000000000000002 x14: 00000000ffffffff x13: 0000000000000001 x12: 0000000000080000 x11: 0000000000006043 x10: ffff80002897d000 x9 : e43ddea79fa87300 x8 : e43ddea79fa87300 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800023067278 x4 : ffff8000151a4820 x3 : ffff80000a84556c x2 : ffff00019f6ddd10 x1 : 0000000000000001 x0 : 0000000000000051 Call trace: umount_check+0x180/0x1bc fs/dcache.c:1672 d_walk+0x68/0x654 fs/dcache.c:1367 do_one_tree+0x40/0xf0 fs/dcache.c:1688 shrink_dcache_for_umount+0x68/0x114 fs/dcache.c:1704 generic_shutdown_super+0x68/0x324 fs/super.c:473 kill_block_super+0x70/0xdc fs/super.c:1470 gfs2_kill_sb+0xc0/0xd4 fs/gfs2/ops_fstype.c:-1 deactivate_locked_super+0xac/0x124 fs/super.c:332 deactivate_super+0xe8/0x108 fs/super.c:363 gfs2_thaw_super+0x184/0x254 fs/gfs2/super.c:828 do_vfs_ioctl+0xfb4/0x206c fs/ioctl.c:-1 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0xe4/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 irq event stamp: 96674 hardirqs last enabled at (96673): [] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:261 hardirqs last disabled at (96674): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (96620): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (96618): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- BUG: Dentry 00000000923cd2e1{i=925,n=/} still in use (3) [unmount of gfs2 loop3] ------------[ cut here ]------------ WARNING: CPU: 0 PID: 4520 at fs/dcache.c:1681 umount_check+0x180/0x1bc fs/dcache.c:1672 Modules linked in: CPU: 0 PID: 4520 Comm: syz.3.20 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : umount_check+0x180/0x1bc fs/dcache.c:1672 lr : umount_check+0x180/0x1bc fs/dcache.c:1672 sp : ffff8000230677a0 x29: ffff8000230677a0 x28: ffff0000cf5ce468 x27: ffff0000cf5ce580 x26: ffff0000cf5ce468 x25: dfff800000000000 x24: ffff0000d8f7c000 x23: dfff800000000000 x22: ffff8000157fe9a0 x21: 0000000000000003 x20: 0000000000000925 x19: ffff0000cf5ce468 x18: ffff800011abbcc0 x17: 756f6d6e755b2029 x16: ffff8000082d22e0 x15: 0000000000000002 x14: 00000000ffffffff x13: 0000000000000001 x12: 0000000000080000 x11: 0000000000021787 x10: ffff80002897d000 x9 : e43ddea79fa87300 x8 : e43ddea79fa87300 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800023067278 x4 : ffff8000151a4820 x3 : ffff800008311d00 x2 : 0000000000000001 x1 : 0000000000000002 x0 : 0000000000000051 Call trace: umount_check+0x180/0x1bc fs/dcache.c:1672 d_walk+0x68/0x654 fs/dcache.c:1367 do_one_tree+0x40/0xf0 fs/dcache.c:1688 shrink_dcache_for_umount+0x68/0x114 fs/dcache.c:1704 generic_shutdown_super+0x68/0x324 fs/super.c:473 kill_block_super+0x70/0xdc fs/super.c:1470 gfs2_kill_sb+0xc0/0xd4 fs/gfs2/ops_fstype.c:-1 deactivate_locked_super+0xac/0x124 fs/super.c:332 deactivate_super+0xe8/0x108 fs/super.c:363 gfs2_thaw_super+0x184/0x254 fs/gfs2/super.c:828 do_vfs_ioctl+0xfb4/0x206c fs/ioctl.c:-1 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0xe4/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 irq event stamp: 97366 hardirqs last enabled at (97365): [] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:261 hardirqs last disabled at (97366): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (97360): [] softirq_handle_end kernel/softirq.c:439 [inline] softirqs last enabled at (97360): [] handle_softirqs+0xaf8/0xc6c kernel/softirq.c:624 softirqs last disabled at (97179): [] __do_softirq+0x14/0x20 kernel/softirq.c:630 ---[ end trace 0000000000000000 ]---