====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz-executor/4330 is trying to acquire lock: ffff0000f412cae0 (&sdp->sd_quota_mutex){+.+.}-{3:3}, at: do_qc+0xc0/0x658 fs/gfs2/quota.c:682 but task is already holding lock: ffff0000e1bccfd0 (&ip->i_rw_mutex){++++}-{3:3}, at: sweep_bh_for_rgrps fs/gfs2/bmap.c:1529 [inline] ffff0000e1bccfd0 (&ip->i_rw_mutex){++++}-{3:3}, at: punch_hole+0x222c/0x3018 fs/gfs2/bmap.c:1854 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ip->i_rw_mutex){++++}-{3:3}: down_read+0x64/0x300 kernel/locking/rwsem.c:1520 __gfs2_iomap_get+0x118/0x10fc fs/gfs2/bmap.c:862 gfs2_iomap_get+0xd4/0x144 fs/gfs2/bmap.c:1413 bh_get+0x1e8/0x608 fs/gfs2/quota.c:385 qdsb_get+0x1c4/0x370 fs/gfs2/quota.c:522 gfs2_quota_hold+0x16c/0x550 fs/gfs2/quota.c:608 gfs2_dinode_dealloc fs/gfs2/super.c:1212 [inline] evict_unlinked_inode+0x3e0/0x608 fs/gfs2/super.c:1410 gfs2_evict_inode+0x560/0xe5c fs/gfs2/super.c:1499 evict+0x3d8/0x824 fs/inode.c:705 iput_final fs/inode.c:1834 [inline] iput+0x728/0x7e8 fs/inode.c:1860 d_delete_notify include/linux/fsnotify.h:267 [inline] vfs_rmdir+0x32c/0x438 fs/namei.c:4255 do_rmdir+0x244/0x524 fs/namei.c:4303 __do_sys_unlinkat fs/namei.c:4483 [inline] __se_sys_unlinkat fs/namei.c:4477 [inline] __arm64_sys_unlinkat+0xcc/0xfc fs/namei.c:4477 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 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 -> #0 (&sdp->sd_quota_mutex){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain kernel/locking/lockdep.c:3830 [inline] __lock_acquire+0x2808/0x6634 kernel/locking/lockdep.c:5063 lock_acquire+0x20c/0x638 kernel/locking/lockdep.c:5678 __mutex_lock_common+0x1a0/0x1f3c kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 do_qc+0xc0/0x658 fs/gfs2/quota.c:682 gfs2_quota_change+0x238/0x718 fs/gfs2/quota.c:1295 punch_hole+0x2ac0/0x3018 fs/gfs2/bmap.c:1955 gfs2_file_dealloc+0x28/0x38 fs/gfs2/bmap.c:2177 evict_unlinked_inode+0x190/0x608 fs/gfs2/super.c:1400 gfs2_evict_inode+0x560/0xe5c fs/gfs2/super.c:1499 evict+0x3d8/0x824 fs/inode.c:705 iput_final fs/inode.c:1834 [inline] iput+0x728/0x7e8 fs/inode.c:1860 do_unlinkat+0x35c/0x504 fs/namei.c:4448 __do_sys_unlinkat fs/namei.c:4484 [inline] __se_sys_unlinkat fs/namei.c:4477 [inline] __arm64_sys_unlinkat+0xe0/0xfc fs/namei.c:4477 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 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 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ip->i_rw_mutex); lock(&sdp->sd_quota_mutex); lock(&ip->i_rw_mutex); lock(&sdp->sd_quota_mutex); *** DEADLOCK *** 4 locks held by syz-executor/4330: #0: ffff0000dd078460 (sb_writers#16){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:402 #1: ffff0000dd078650 (sb_internal#4){.+.+}-{0:0}, at: gfs2_trans_begin+0xa8/0x114 fs/gfs2/trans.c:118 #2: ffff0000f412d058 (&sdp->sd_log_flush_lock){.+.+}-{3:3}, at: __gfs2_trans_begin+0x50c/0x884 fs/gfs2/trans.c:87 #3: ffff0000e1bccfd0 (&ip->i_rw_mutex){++++}-{3:3}, at: sweep_bh_for_rgrps fs/gfs2/bmap.c:1529 [inline] #3: ffff0000e1bccfd0 (&ip->i_rw_mutex){++++}-{3:3}, at: punch_hole+0x222c/0x3018 fs/gfs2/bmap.c:1854 stack backtrace: CPU: 0 PID: 4330 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2048 check_noncircular+0x264/0x2f8 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain kernel/locking/lockdep.c:3830 [inline] __lock_acquire+0x2808/0x6634 kernel/locking/lockdep.c:5063 lock_acquire+0x20c/0x638 kernel/locking/lockdep.c:5678 __mutex_lock_common+0x1a0/0x1f3c kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 do_qc+0xc0/0x658 fs/gfs2/quota.c:682 gfs2_quota_change+0x238/0x718 fs/gfs2/quota.c:1295 punch_hole+0x2ac0/0x3018 fs/gfs2/bmap.c:1955 gfs2_file_dealloc+0x28/0x38 fs/gfs2/bmap.c:2177 evict_unlinked_inode+0x190/0x608 fs/gfs2/super.c:1400 gfs2_evict_inode+0x560/0xe5c fs/gfs2/super.c:1499 evict+0x3d8/0x824 fs/inode.c:705 iput_final fs/inode.c:1834 [inline] iput+0x728/0x7e8 fs/inode.c:1860 do_unlinkat+0x35c/0x504 fs/namei.c:4448 __do_sys_unlinkat fs/namei.c:4484 [inline] __se_sys_unlinkat fs/namei.c:4477 [inline] __arm64_sys_unlinkat+0xe0/0xfc fs/namei.c:4477 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 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 XFS (loop0): Unmounting Filesystem