====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.731/6477 is trying to acquire lock: ffff88807b570ae0 (&sdp->sd_quota_mutex){+.+.}-{3:3}, at: do_qc+0xc0/0x6c0 fs/gfs2/quota.c:678 but task is already holding lock: ffff88805d9585e8 (&ip->i_rw_mutex){++++}-{3:3}, at: sweep_bh_for_rgrps fs/gfs2/bmap.c:1531 [inline] ffff88805d9585e8 (&ip->i_rw_mutex){++++}-{3:3}, at: punch_hole+0x272a/0x3700 fs/gfs2/bmap.c:1856 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+0x44/0x2e0 kernel/locking/rwsem.c:1498 __gfs2_iomap_get+0x164/0x1390 fs/gfs2/bmap.c:864 gfs2_iomap_get fs/gfs2/bmap.c:1415 [inline] gfs2_block_map+0x299/0x6f0 fs/gfs2/bmap.c:1230 bh_get+0x275/0x650 fs/gfs2/quota.c:385 qdsb_get+0x21c/0x3c0 fs/gfs2/quota.c:518 gfs2_quota_hold+0x18d/0x5b0 fs/gfs2/quota.c:604 punch_hole+0xe27/0x3700 fs/gfs2/bmap.c:1817 gfs2_iomap_end+0x4a1/0x7b0 fs/gfs2/bmap.c:1176 iomap_iter+0x213/0xda0 fs/iomap/iter.c:62 iomap_file_buffered_write+0x520/0x630 fs/iomap/buffered-io.c:821 gfs2_file_buffered_write+0x45d/0x910 fs/gfs2/file.c:1058 gfs2_file_write_iter+0x4a9/0x11f0 fs/gfs2/file.c:1166 call_write_iter include/linux/fs.h:2179 [inline] aio_write+0x54a/0x780 fs/aio.c:1594 __io_submit_one fs/aio.c:-1 [inline] io_submit_one+0x6d2/0x1310 fs/aio.c:2013 __do_sys_io_submit fs/aio.c:2072 [inline] __se_sys_io_submit+0x19d/0x310 fs/aio.c:2042 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #0 (&sdp->sd_quota_mutex){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3120 [inline] check_prevs_add kernel/locking/lockdep.c:3239 [inline] validate_chain kernel/locking/lockdep.c:3855 [inline] __lock_acquire+0x38f7/0x7d40 kernel/locking/lockdep.c:5120 lock_acquire+0x19f/0x400 kernel/locking/lockdep.c:5737 __mutex_lock_common+0x1e5/0x2400 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 do_qc+0xc0/0x6c0 fs/gfs2/quota.c:678 gfs2_quota_change+0x293/0x7a0 fs/gfs2/quota.c:1295 punch_hole+0x310b/0x3700 fs/gfs2/bmap.c:1957 gfs2_iomap_end+0x4a1/0x7b0 fs/gfs2/bmap.c:1176 iomap_iter+0x213/0xda0 fs/iomap/iter.c:62 iomap_file_buffered_write+0x520/0x630 fs/iomap/buffered-io.c:821 gfs2_file_buffered_write+0x45d/0x910 fs/gfs2/file.c:1058 gfs2_file_write_iter+0x4a9/0x11f0 fs/gfs2/file.c:1166 call_write_iter include/linux/fs.h:2179 [inline] aio_write+0x54a/0x780 fs/aio.c:1594 __io_submit_one fs/aio.c:-1 [inline] io_submit_one+0x6d2/0x1310 fs/aio.c:2013 __do_sys_io_submit fs/aio.c:2072 [inline] __se_sys_io_submit+0x19d/0x310 fs/aio.c:2042 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 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.0.731/6477: #0: ffff88805d958150 (&sb->s_type->i_mutex_key#23){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:793 [inline] #0: ffff88805d958150 (&sb->s_type->i_mutex_key#23){+.+.}-{3:3}, at: gfs2_file_write_iter+0x360/0x11f0 fs/gfs2/file.c:1123 #1: ffff888053950650 (sb_internal#2){.+.+}-{0:0}, at: gfs2_trans_begin+0x6b/0xe0 fs/gfs2/trans.c:118 #2: ffff88807b5710a8 (&sdp->sd_log_flush_lock){.+.+}-{3:3}, at: __gfs2_trans_begin+0x535/0x8b0 fs/gfs2/trans.c:87 #3: ffff88805d9585e8 (&ip->i_rw_mutex){++++}-{3:3}, at: sweep_bh_for_rgrps fs/gfs2/bmap.c:1531 [inline] #3: ffff88805d9585e8 (&ip->i_rw_mutex){++++}-{3:3}, at: punch_hole+0x272a/0x3700 fs/gfs2/bmap.c:1856 stack backtrace: CPU: 0 PID: 6477 Comm: syz.0.731 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 Call Trace: dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 check_noncircular+0x2f8/0x400 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3120 [inline] check_prevs_add kernel/locking/lockdep.c:3239 [inline] validate_chain kernel/locking/lockdep.c:3855 [inline] __lock_acquire+0x38f7/0x7d40 kernel/locking/lockdep.c:5120 lock_acquire+0x19f/0x400 kernel/locking/lockdep.c:5737 __mutex_lock_common+0x1e5/0x2400 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 do_qc+0xc0/0x6c0 fs/gfs2/quota.c:678 gfs2_quota_change+0x293/0x7a0 fs/gfs2/quota.c:1295 punch_hole+0x310b/0x3700 fs/gfs2/bmap.c:1957 gfs2_iomap_end+0x4a1/0x7b0 fs/gfs2/bmap.c:1176 iomap_iter+0x213/0xda0 fs/iomap/iter.c:62 iomap_file_buffered_write+0x520/0x630 fs/iomap/buffered-io.c:821 gfs2_file_buffered_write+0x45d/0x910 fs/gfs2/file.c:1058 gfs2_file_write_iter+0x4a9/0x11f0 fs/gfs2/file.c:1166 call_write_iter include/linux/fs.h:2179 [inline] aio_write+0x54a/0x780 fs/aio.c:1594 __io_submit_one fs/aio.c:-1 [inline] io_submit_one+0x6d2/0x1310 fs/aio.c:2013 __do_sys_io_submit fs/aio.c:2072 [inline] __se_sys_io_submit+0x19d/0x310 fs/aio.c:2042 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fa7ee12cb19 Code: ff c3 66 2e 0f 1f 84 00 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 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa7ec383028 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1 RAX: ffffffffffffffda RBX: 00007fa7ee3b2fa0 RCX: 00007fa7ee12cb19 RDX: 00002000000e1040 RSI: 000000000000003b RDI: 00007fa7ec35a000 RBP: 00007fa7ee1c4b70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa7ee3b3038 R14: 00007fa7ee3b2fa0 R15: 00007ffd8aeab538