capability: warning: `syz.9.577' uses deprecated v2 capabilities in a way that may be insecure ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.9.577/7388 is trying to acquire lock: ffff88807d36cae0 (&sdp->sd_quota_mutex){+.+.}-{3:3}, at: do_qc+0xca/0x730 fs/gfs2/quota.c:682 but task is already holding lock: ffff88804f243ba8 (&ip->i_rw_mutex){++++}-{3:3}, at: __gfs2_iomap_alloc+0x286/0x1a30 fs/gfs2/bmap.c:685 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+0x42/0x2d0 kernel/locking/rwsem.c:1520 __gfs2_iomap_get+0x15b/0x1400 fs/gfs2/bmap.c:862 gfs2_iomap_get+0xeb/0x170 fs/gfs2/bmap.c:1413 bh_get+0x26d/0x780 fs/gfs2/quota.c:385 qdsb_get+0x21c/0x3c0 fs/gfs2/quota.c:522 gfs2_quota_hold+0x194/0x5d0 fs/gfs2/quota.c:608 gfs2_quota_lock+0xa0/0x7d0 fs/gfs2/quota.c:1076 gfs2_quota_lock_check fs/gfs2/quota.h:50 [inline] __gfs2_fallocate+0x90a/0x1cd0 fs/gfs2/file.c:1298 gfs2_fallocate+0x36d/0x4b0 fs/gfs2/file.c:1395 vfs_fallocate+0x584/0x6f0 fs/open.c:323 ioctl_preallocate fs/ioctl.c:290 [inline] file_ioctl fs/ioctl.c:330 [inline] do_vfs_ioctl+0x19af/0x1d40 fs/ioctl.c:849 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl+0x83/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/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:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2d07/0x7d10 kernel/locking/lockdep.c:5049 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12d/0xaf0 kernel/locking/mutex.c:747 do_qc+0xca/0x730 fs/gfs2/quota.c:682 gfs2_quota_change+0x2f5/0x8e0 fs/gfs2/quota.c:1295 gfs2_alloc_blocks+0x18c1/0x2080 fs/gfs2/rgrp.c:2494 __gfs2_iomap_alloc+0x4de/0x1a30 fs/gfs2/bmap.c:711 gfs2_iomap_alloc+0x15d/0x200 fs/gfs2/bmap.c:1426 fallocate_chunk fs/gfs2/file.c:1192 [inline] __gfs2_fallocate+0xfe3/0x1cd0 fs/gfs2/file.c:1331 gfs2_fallocate+0x36d/0x4b0 fs/gfs2/file.c:1395 vfs_fallocate+0x584/0x6f0 fs/open.c:323 ioctl_preallocate fs/ioctl.c:290 [inline] file_ioctl fs/ioctl.c:330 [inline] do_vfs_ioctl+0x19af/0x1d40 fs/ioctl.c:849 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl+0x83/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 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.9.577/7388: #0: ffff888076750460 (sb_writers#22){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3015 [inline] #0: ffff888076750460 (sb_writers#22){.+.+}-{0:0}, at: vfs_fallocate+0x4f1/0x6f0 fs/open.c:322 #1: ffff88804f243710 (&sb->s_type->i_mutex_key#27){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff88804f243710 (&sb->s_type->i_mutex_key#27){+.+.}-{3:3}, at: gfs2_fallocate+0x1c9/0x4b0 fs/gfs2/file.c:1374 #2: ffff888076750650 (sb_internal#6){.+.+}-{0:0}, at: gfs2_trans_begin+0x6b/0xe0 fs/gfs2/trans.c:118 #3: ffff88807d36d058 (&sdp->sd_log_flush_lock){.+.+}-{3:3}, at: __gfs2_trans_begin+0x513/0x890 fs/gfs2/trans.c:87 #4: ffff88804f243ba8 (&ip->i_rw_mutex){++++}-{3:3}, at: __gfs2_iomap_alloc+0x286/0x1a30 fs/gfs2/bmap.c:685 stack backtrace: CPU: 1 PID: 7388 Comm: syz.9.577 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 check_noncircular+0x296/0x330 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 kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2d07/0x7d10 kernel/locking/lockdep.c:5049 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12d/0xaf0 kernel/locking/mutex.c:747 do_qc+0xca/0x730 fs/gfs2/quota.c:682 gfs2_quota_change+0x2f5/0x8e0 fs/gfs2/quota.c:1295 gfs2_alloc_blocks+0x18c1/0x2080 fs/gfs2/rgrp.c:2494 __gfs2_iomap_alloc+0x4de/0x1a30 fs/gfs2/bmap.c:711 gfs2_iomap_alloc+0x15d/0x200 fs/gfs2/bmap.c:1426 fallocate_chunk fs/gfs2/file.c:1192 [inline] __gfs2_fallocate+0xfe3/0x1cd0 fs/gfs2/file.c:1331 gfs2_fallocate+0x36d/0x4b0 fs/gfs2/file.c:1395 vfs_fallocate+0x584/0x6f0 fs/open.c:323 ioctl_preallocate fs/ioctl.c:290 [inline] file_ioctl fs/ioctl.c:330 [inline] do_vfs_ioctl+0x19af/0x1d40 fs/ioctl.c:849 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl+0x83/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fa59ef9ce59 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:00007fa59fdd6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fa59f215fa0 RCX: 00007fa59ef9ce59 RDX: 0000200000000240 RSI: 0000000040305828 RDI: 0000000000000004 RBP: 00007fa59f032d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa59f216038 R14: 00007fa59f215fa0 R15: 00007fffb240abb8