gfs2: fsid=syz:syz.0: first mount done, others may mount ====================================================== WARNING: possible circular locking dependency detected 6.1.113-syzkaller #0 Not tainted ------------------------------------------------------ syz.4.56/3845 is trying to acquire lock: ffff888075018ae0 (&sdp->sd_quota_mutex){+.+.}-{3:3}, at: do_qc+0xc8/0x720 fs/gfs2/quota.c:682 but task is already holding lock: ffff88807221cfd0 (&ip->i_rw_mutex){++++}-{3:3}, at: __gfs2_iomap_alloc+0x2b7/0x2090 fs/gfs2/bmap.c:679 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 gfs2_quota_lock+0x9f/0x450 fs/gfs2/quota.c:1076 gfs2_quota_lock_check fs/gfs2/quota.h:50 [inline] __gfs2_fallocate+0xa77/0x1df0 fs/gfs2/file.c:1297 gfs2_fallocate+0x358/0x490 fs/gfs2/file.c:1394 vfs_fallocate+0x547/0x6b0 fs/open.c:323 ksys_fallocate fs/open.c:346 [inline] __do_sys_fallocate fs/open.c:354 [inline] __se_sys_fallocate fs/open.c:352 [inline] __x64_sys_fallocate+0xb9/0x100 fs/open.c:352 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 gfs2_alloc_blocks+0x1e50/0x28c0 fs/gfs2/rgrp.c:2494 __gfs2_iomap_alloc+0x4f0/0x2090 fs/gfs2/bmap.c:705 gfs2_iomap_alloc+0x155/0x1f0 fs/gfs2/bmap.c:1409 fallocate_chunk fs/gfs2/file.c:1191 [inline] __gfs2_fallocate+0x102c/0x1df0 fs/gfs2/file.c:1330 gfs2_fallocate+0x358/0x490 fs/gfs2/file.c:1394 vfs_fallocate+0x547/0x6b0 fs/open.c:323 ksys_fallocate fs/open.c:346 [inline] __do_sys_fallocate fs/open.c:354 [inline] __se_sys_fallocate fs/open.c:352 [inline] __x64_sys_fallocate+0xb9/0x100 fs/open.c:352 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 *** 5 locks held by syz.4.56/3845: #0: ffff888078454460 (sb_writers#13){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3015 [inline] #0: ffff888078454460 (sb_writers#13){.+.+}-{0:0}, at: vfs_fallocate+0x4ba/0x6b0 fs/open.c:322 #1: ffff88807221cb38 (&sb->s_type->i_mutex_key#21){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff88807221cb38 (&sb->s_type->i_mutex_key#21){+.+.}-{3:3}, at: gfs2_fallocate+0x198/0x490 fs/gfs2/file.c:1373 #2: ffff888078454650 (sb_internal#2){.+.+}-{0:0}, at: gfs2_trans_begin+0x6d/0xe0 fs/gfs2/trans.c:118 #3: ffff888075019058 (&sdp->sd_log_flush_lock){.+.+}-{3:3}, at: __gfs2_trans_begin+0x558/0x940 fs/gfs2/trans.c:87 #4: ffff88807221cfd0 (&ip->i_rw_mutex){++++}-{3:3}, at: __gfs2_iomap_alloc+0x2b7/0x2090 fs/gfs2/bmap.c:679 stack backtrace: CPU: 0 PID: 3845 Comm: syz.4.56 Not tainted 6.1.113-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 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 gfs2_alloc_blocks+0x1e50/0x28c0 fs/gfs2/rgrp.c:2494 __gfs2_iomap_alloc+0x4f0/0x2090 fs/gfs2/bmap.c:705 gfs2_iomap_alloc+0x155/0x1f0 fs/gfs2/bmap.c:1409 fallocate_chunk fs/gfs2/file.c:1191 [inline] __gfs2_fallocate+0x102c/0x1df0 fs/gfs2/file.c:1330 gfs2_fallocate+0x358/0x490 fs/gfs2/file.c:1394 vfs_fallocate+0x547/0x6b0 fs/open.c:323 ksys_fallocate fs/open.c:346 [inline] __do_sys_fallocate fs/open.c:354 [inline] __se_sys_fallocate fs/open.c:352 [inline] __x64_sys_fallocate+0xb9/0x100 fs/open.c:352 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: 0033:0x7ffb67b7dff9 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:00007ffb688f4038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007ffb67d35f80 RCX: 00007ffb67b7dff9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007ffb67bf0296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000280404 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffb67d35f80 R15: 00007ffd5e333cd8