capability: warning: `syz.5.50' uses deprecated v2 capabilities in a way that may be insecure fuse: Bad value for 'fd' ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.5.50/4786 is trying to acquire lock: ffff88807de8cae0 (&sdp->sd_quota_mutex){+.+.}-{3:3}, at: do_qc+0xca/0x730 fs/gfs2/quota.c:678 but task is already holding lock: ffff88805e5c8cb0 (&ip->i_rw_mutex){++++}-{3:3}, at: __gfs2_iomap_alloc+0x271/0x1a20 fs/gfs2/bmap.c:681 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+0x155/0x13e0 fs/gfs2/bmap.c:858 gfs2_iomap_get fs/gfs2/bmap.c:1398 [inline] gfs2_block_map+0x229/0x670 fs/gfs2/bmap.c:1213 bh_get+0x227/0x5f0 fs/gfs2/quota.c:385 qdsb_get+0x21c/0x3c0 fs/gfs2/quota.c:518 gfs2_quota_hold+0x194/0x5d0 fs/gfs2/quota.c:604 gfs2_quota_lock+0xa0/0x7d0 fs/gfs2/quota.c:1076 gfs2_quota_lock_check fs/gfs2/quota.h:50 [inline] alloc_dinode+0x164/0x4f0 fs/gfs2/inode.c:402 gfs2_create_inode+0xc22/0x13b0 fs/gfs2/inode.c:721 gfs2_create+0x34/0x40 fs/gfs2/inode.c:852 vfs_create+0x2db/0x460 fs/namei.c:3162 do_mknodat+0x39d/0x620 fs/namei.c:3994 __do_sys_mknodat fs/namei.c:4022 [inline] __se_sys_mknodat fs/namei.c:4019 [inline] __x64_sys_mknodat+0xa5/0xc0 fs/namei.c:4019 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:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2c33/0x7c60 kernel/locking/lockdep.c:5012 lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1eb/0x2390 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+0xca/0x730 fs/gfs2/quota.c:678 gfs2_quota_change+0x2f5/0x8e0 fs/gfs2/quota.c:1295 gfs2_alloc_blocks+0x195e/0x2110 fs/gfs2/rgrp.c:2504 __gfs2_iomap_alloc+0x4d1/0x1a20 fs/gfs2/bmap.c:707 gfs2_iomap_alloc+0x14d/0x1d0 fs/gfs2/bmap.c:1411 fallocate_chunk fs/gfs2/file.c:1200 [inline] __gfs2_fallocate+0xf7e/0x1c10 fs/gfs2/file.c:1339 gfs2_fallocate+0x339/0x470 fs/gfs2/file.c:1403 vfs_fallocate+0x587/0x6f0 fs/open.c:308 ioctl_preallocate fs/ioctl.c:294 [inline] file_ioctl fs/ioctl.c:-1 [inline] do_vfs_ioctl+0x1b70/0x1de0 fs/ioctl.c:853 __do_sys_ioctl fs/ioctl.c:872 [inline] __se_sys_ioctl+0x83/0x170 fs/ioctl.c:860 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 *** 5 locks held by syz.5.50/4786: #0: ffff888024554460 (sb_writers#20){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3042 [inline] #0: ffff888024554460 (sb_writers#20){.+.+}-{0:0}, at: vfs_fallocate+0x4f4/0x6f0 fs/open.c:307 #1: ffff88805e5c8818 (&sb->s_type->i_mutex_key#25){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #1: ffff88805e5c8818 (&sb->s_type->i_mutex_key#25){+.+.}-{3:3}, at: gfs2_fallocate+0x1ab/0x470 fs/gfs2/file.c:1382 #2: ffff888024554650 (sb_internal#2){.+.+}-{0:0}, at: gfs2_trans_begin+0x6b/0xe0 fs/gfs2/trans.c:118 #3: ffff88807de8d0a8 (&sdp->sd_log_flush_lock){.+.+}-{3:3}, at: __gfs2_trans_begin+0x50f/0x880 fs/gfs2/trans.c:87 #4: ffff88805e5c8cb0 (&ip->i_rw_mutex){++++}-{3:3}, at: __gfs2_iomap_alloc+0x271/0x1a20 fs/gfs2/bmap.c:681 stack backtrace: CPU: 0 PID: 4786 Comm: syz.5.50 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 check_noncircular+0x274/0x310 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2c33/0x7c60 kernel/locking/lockdep.c:5012 lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1eb/0x2390 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+0xca/0x730 fs/gfs2/quota.c:678 gfs2_quota_change+0x2f5/0x8e0 fs/gfs2/quota.c:1295 gfs2_alloc_blocks+0x195e/0x2110 fs/gfs2/rgrp.c:2504 __gfs2_iomap_alloc+0x4d1/0x1a20 fs/gfs2/bmap.c:707 gfs2_iomap_alloc+0x14d/0x1d0 fs/gfs2/bmap.c:1411 fallocate_chunk fs/gfs2/file.c:1200 [inline] __gfs2_fallocate+0xf7e/0x1c10 fs/gfs2/file.c:1339 gfs2_fallocate+0x339/0x470 fs/gfs2/file.c:1403 vfs_fallocate+0x587/0x6f0 fs/open.c:308 ioctl_preallocate fs/ioctl.c:294 [inline] file_ioctl fs/ioctl.c:-1 [inline] do_vfs_ioctl+0x1b70/0x1de0 fs/ioctl.c:853 __do_sys_ioctl fs/ioctl.c:872 [inline] __se_sys_ioctl+0x83/0x170 fs/ioctl.c:860 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: 0033:0x7f23f2545ec9 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:00007f23f07ad038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f23f279cfa0 RCX: 00007f23f2545ec9 RDX: 0000200000000080 RSI: 0000000040305828 RDI: 0000000000000007 RBP: 00007f23f25c8f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f23f279d038 R14: 00007f23f279cfa0 R15: 00007ffd54fd68e8