====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.1.27/6037 is trying to acquire lock: ffff888051e74ae8 (&sdp->sd_quota_mutex){+.+.}-{3:3}, at: do_qc+0xaf/0x670 fs/gfs2/quota.c:689 but task is already holding lock: ffff88805d519358 (&ip->i_rw_mutex){++++}-{3:3}, at: sweep_bh_for_rgrps fs/gfs2/bmap.c:1543 [inline] ffff88805d519358 (&ip->i_rw_mutex){++++}-{3:3}, at: punch_hole+0x1d80/0x2ec0 fs/gfs2/bmap.c:1867 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+0x46/0x2e0 kernel/locking/rwsem.c:1520 __gfs2_iomap_get+0x15f/0x1400 fs/gfs2/bmap.c:862 gfs2_iomap_get+0xef/0x170 fs/gfs2/bmap.c:1427 bh_get+0x251/0x760 fs/gfs2/quota.c:401 qdsb_get+0x210/0x330 fs/gfs2/quota.c:535 gfs2_quota_hold+0x198/0x5e0 fs/gfs2/quota.c:615 gfs2_dinode_dealloc fs/gfs2/super.c:1226 [inline] evict_unlinked_inode fs/gfs2/super.c:1437 [inline] gfs2_evict_inode+0xeb0/0x1350 fs/gfs2/super.c:1523 evict+0x4ca/0x8d0 fs/inode.c:705 do_unlinkat+0x38c/0x590 fs/namei.c:4406 __do_sys_unlink fs/namei.c:4447 [inline] __se_sys_unlink fs/namei.c:4445 [inline] __x64_sys_unlink+0x49/0x50 fs/namei.c:4445 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&sdp->sd_quota_mutex){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2df1/0x7d40 kernel/locking/lockdep.c:5137 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x136/0xcc0 kernel/locking/mutex.c:747 do_qc+0xaf/0x670 fs/gfs2/quota.c:689 gfs2_quota_change+0x2b9/0x800 fs/gfs2/quota.c:1289 punch_hole+0x2902/0x2ec0 fs/gfs2/bmap.c:1968 gfs2_iomap_end+0x5e5/0x7a0 fs/gfs2/bmap.c:1188 iomap_iter+0x21e/0xec0 fs/iomap/iter.c:79 iomap_file_buffered_write+0xbc0/0xd80 fs/iomap/buffered-io.c:999 gfs2_file_buffered_write+0x4bd/0x820 fs/gfs2/file.c:1060 gfs2_file_write_iter+0x48d/0xe90 fs/gfs2/file.c:1158 __kernel_write_iter+0x28c/0x690 fs/read_write.c:517 dump_emit_page fs/coredump.c:957 [inline] dump_user_range+0x420/0x860 fs/coredump.c:984 elf_core_dump+0x31d0/0x3770 fs/binfmt_elf.c:2184 do_coredump+0x17cc/0x24d0 fs/coredump.c:833 get_signal+0x1133/0x13f0 kernel/signal.c:2888 arch_do_signal_or_restart+0xc2/0x800 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 irqentry_exit_to_user_mode+0x9/0x30 kernel/entry/common.c:315 exc_page_fault+0x8c/0x100 arch/x86/mm/fault.c:1519 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608 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 *** 5 locks held by syz.1.27/6037: #0: ffff88803153c418 (sb_writers#17){.+.+}-{0:0}, at: do_coredump+0x17ab/0x24d0 fs/coredump.c:832 #1: ffff88805d518ed0 (&sb->s_type->i_mutex_key#23){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] #1: ffff88805d518ed0 (&sb->s_type->i_mutex_key#23){+.+.}-{3:3}, at: gfs2_file_write_iter+0x352/0xe90 fs/gfs2/file.c:1115 #2: ffff88803153c608 (sb_internal#3){.+.+}-{0:0}, at: gfs2_trans_begin+0x6f/0xe0 fs/gfs2/trans.c:118 #3: ffff888051e75060 (&sdp->sd_log_flush_lock){.+.+}-{3:3}, at: __gfs2_trans_begin+0x517/0x890 fs/gfs2/trans.c:87 #4: ffff88805d519358 (&ip->i_rw_mutex){++++}-{3:3}, at: sweep_bh_for_rgrps fs/gfs2/bmap.c:1543 [inline] #4: ffff88805d519358 (&ip->i_rw_mutex){++++}-{3:3}, at: punch_hole+0x1d80/0x2ec0 fs/gfs2/bmap.c:1867 stack backtrace: CPU: 1 PID: 6037 Comm: syz.1.27 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 check_noncircular+0x2fc/0x400 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2df1/0x7d40 kernel/locking/lockdep.c:5137 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x136/0xcc0 kernel/locking/mutex.c:747 do_qc+0xaf/0x670 fs/gfs2/quota.c:689 gfs2_quota_change+0x2b9/0x800 fs/gfs2/quota.c:1289 punch_hole+0x2902/0x2ec0 fs/gfs2/bmap.c:1968 gfs2_iomap_end+0x5e5/0x7a0 fs/gfs2/bmap.c:1188 iomap_iter+0x21e/0xec0 fs/iomap/iter.c:79 iomap_file_buffered_write+0xbc0/0xd80 fs/iomap/buffered-io.c:999 gfs2_file_buffered_write+0x4bd/0x820 fs/gfs2/file.c:1060 gfs2_file_write_iter+0x48d/0xe90 fs/gfs2/file.c:1158 __kernel_write_iter+0x28c/0x690 fs/read_write.c:517 dump_emit_page fs/coredump.c:957 [inline] dump_user_range+0x420/0x860 fs/coredump.c:984 elf_core_dump+0x31d0/0x3770 fs/binfmt_elf.c:2184 do_coredump+0x17cc/0x24d0 fs/coredump.c:833 get_signal+0x1133/0x13f0 kernel/signal.c:2888 arch_do_signal_or_restart+0xc2/0x800 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 irqentry_exit_to_user_mode+0x9/0x30 kernel/entry/common.c:315 exc_page_fault+0x8c/0x100 arch/x86/mm/fault.c:1519 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608 RIP: 0033:0x7fb744b9c821 Code: 00 00 00 00 0f 1f 44 00 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 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f RSP: 002b:fffffffffffffea0 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007fb744e15fa0 RCX: 00007fb744b9c819 RDX: 0000000000000000 RSI: fffffffffffffea0 RDI: 0000000000000000 RBP: 00007fb744c32c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb744e16038 R14: 00007fb744e15fa0 R15: 00007fffd89b4a98 sched: RT throttling activated