====================================================== WARNING: possible circular locking dependency detected 6.1.132-syzkaller #0 Not tainted ------------------------------------------------------ syz.4.21/4465 is trying to acquire lock: ffff888079944ae0 (&sdp->sd_quota_mutex){+.+.}-{3:3}, at: do_qc+0xc8/0x720 fs/gfs2/quota.c:682 but task is already holding lock: ffff888071acd688 (&ip->i_rw_mutex){++++}-{3:3}, at: sweep_bh_for_rgrps fs/gfs2/bmap.c:1512 [inline] ffff888071acd688 (&ip->i_rw_mutex){++++}-{3:3}, at: punch_hole+0x1b76/0x32c0 fs/gfs2/bmap.c:1837 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ip->i_rw_mutex){++++}-{3:3}: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 down_read+0xad/0xa30 kernel/locking/rwsem.c:1520 __gfs2_iomap_get+0x178/0x1480 fs/gfs2/bmap.c:856 gfs2_iomap_get+0xdb/0x150 fs/gfs2/bmap.c:1396 bh_get+0x286/0x800 fs/gfs2/quota.c:385 qdsb_get+0x209/0x3b0 fs/gfs2/quota.c:522 gfs2_quota_hold+0x19d/0x5c0 fs/gfs2/quota.c:608 punch_hole+0xaa0/0x32c0 fs/gfs2/bmap.c:1798 gfs2_iomap_end+0x511/0x6d0 fs/gfs2/bmap.c:1157 iomap_iter+0x22c/0x10a0 fs/iomap/iter.c:79 iomap_file_buffered_write+0xabe/0xc90 fs/iomap/buffered-io.c:846 gfs2_file_buffered_write+0x4e3/0x870 fs/gfs2/file.c:1057 gfs2_file_write_iter+0x415/0xe90 fs/gfs2/file.c:1158 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x857/0xbc0 fs/read_write.c:584 ksys_write+0x19c/0x2c0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&sdp->sd_quota_mutex){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747 do_qc+0xc8/0x720 fs/gfs2/quota.c:682 gfs2_quota_change+0x2db/0x8c0 fs/gfs2/quota.c:1295 punch_hole+0x2c9c/0x32c0 fs/gfs2/bmap.c:1938 gfs2_iomap_end+0x511/0x6d0 fs/gfs2/bmap.c:1157 iomap_iter+0x22c/0x10a0 fs/iomap/iter.c:79 iomap_file_buffered_write+0xabe/0xc90 fs/iomap/buffered-io.c:846 gfs2_file_buffered_write+0x4e3/0x870 fs/gfs2/file.c:1057 gfs2_file_write_iter+0x415/0xe90 fs/gfs2/file.c:1158 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x857/0xbc0 fs/read_write.c:584 ksys_write+0x19c/0x2c0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 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 *** 6 locks held by syz.4.21/4465: #0: ffff8880213a54e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2ba/0x360 fs/file.c:1032 #1: ffff88801d27a460 (sb_writers#16){.+.+}-{0:0}, at: vfs_write+0x269/0xbc0 fs/read_write.c:580 #2: ffff888071acd1f0 (&sb->s_type->i_mutex_key#22){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #2: ffff888071acd1f0 (&sb->s_type->i_mutex_key#22){+.+.}-{3:3}, at: gfs2_file_write_iter+0x347/0xe90 fs/gfs2/file.c:1115 #3: ffff88801d27a650 (sb_internal#3){.+.+}-{0:0}, at: gfs2_trans_begin+0x6d/0xe0 fs/gfs2/trans.c:118 #4: ffff888079945058 (&sdp->sd_log_flush_lock){.+.+}-{3:3}, at: __gfs2_trans_begin+0x558/0x940 fs/gfs2/trans.c:87 #5: ffff888071acd688 (&ip->i_rw_mutex){++++}-{3:3}, at: sweep_bh_for_rgrps fs/gfs2/bmap.c:1512 [inline] #5: ffff888071acd688 (&ip->i_rw_mutex){++++}-{3:3}, at: punch_hole+0x1b76/0x32c0 fs/gfs2/bmap.c:1837 stack backtrace: CPU: 1 PID: 4465 Comm: syz.4.21 Not tainted 6.1.132-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 check_noncircular+0x2fa/0x3b0 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747 do_qc+0xc8/0x720 fs/gfs2/quota.c:682 gfs2_quota_change+0x2db/0x8c0 fs/gfs2/quota.c:1295 punch_hole+0x2c9c/0x32c0 fs/gfs2/bmap.c:1938 gfs2_iomap_end+0x511/0x6d0 fs/gfs2/bmap.c:1157 iomap_iter+0x22c/0x10a0 fs/iomap/iter.c:79 iomap_file_buffered_write+0xabe/0xc90 fs/iomap/buffered-io.c:846 gfs2_file_buffered_write+0x4e3/0x870 fs/gfs2/file.c:1057 gfs2_file_write_iter+0x415/0xe90 fs/gfs2/file.c:1158 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x857/0xbc0 fs/read_write.c:584 ksys_write+0x19c/0x2c0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f816c58d169 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:00007f816d413038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f816c7a6320 RCX: 00007f816c58d169 RDX: 000000000208e24b RSI: 00002000000004c0 RDI: 0000000000000009 RBP: 00007f816c60e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f816c7a6320 R15: 00007ffe6e0d9978