gfs2: fsid=syz:syz.0: first mount done, others may mount gfs2: fsid=syz:syz.0: found 1 quota changes ====================================================== WARNING: possible circular locking dependency detected 5.15.184-syzkaller #0 Not tainted ------------------------------------------------------ syz.1.26/4195 is trying to acquire lock: ffff0000d67d8ae0 (&sdp->sd_quota_mutex){+.+.}-{3:3}, at: do_qc+0xbc/0x690 fs/gfs2/quota.c:678 but task is already holding lock: ffff0000e927d748 (&ip->i_rw_mutex){++++}-{3:3}, at: sweep_bh_for_rgrps fs/gfs2/bmap.c:1514 [inline] ffff0000e927d748 (&ip->i_rw_mutex){++++}-{3:3}, at: punch_hole+0x1d94/0x2cb0 fs/gfs2/bmap.c:1839 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+0xc0/0x390 kernel/locking/rwsem.c:1498 __gfs2_iomap_get+0x10c/0x100c fs/gfs2/bmap.c:858 gfs2_iomap_get fs/gfs2/bmap.c:1398 [inline] gfs2_block_map+0x2b4/0xbc8 fs/gfs2/bmap.c:1213 bh_get+0x1bc/0x51c fs/gfs2/quota.c:385 qdsb_get+0x1e0/0x3a8 fs/gfs2/quota.c:518 gfs2_quota_hold+0x16c/0x558 fs/gfs2/quota.c:604 punch_hole+0xb24/0x2cb0 fs/gfs2/bmap.c:1800 gfs2_iomap_end+0x43c/0x61c fs/gfs2/bmap.c:1159 iomap_iter+0x1d4/0xf20 fs/iomap/iter.c:62 iomap_file_buffered_write+0x430/0x4f0 fs/iomap/buffered-io.c:814 gfs2_file_buffered_write+0x3d0/0x880 fs/gfs2/file.c:1058 gfs2_file_write_iter+0x39c/0xbd8 fs/gfs2/file.c:1166 call_write_iter include/linux/fs.h:2172 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x7c8/0xa2c fs/read_write.c:594 ksys_write+0x120/0x210 fs/read_write.c:647 __do_sys_write fs/read_write.c:659 [inline] __se_sys_write fs/read_write.c:656 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:656 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 -> #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+0x2928/0x651c kernel/locking/lockdep.c:5012 lock_acquire+0x1f4/0x620 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x194/0x1edc kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0xac/0x11c kernel/locking/mutex.c:743 do_qc+0xbc/0x690 fs/gfs2/quota.c:678 gfs2_quota_change+0x238/0x718 fs/gfs2/quota.c:1295 punch_hole+0x27e4/0x2cb0 fs/gfs2/bmap.c:1940 gfs2_iomap_end+0x43c/0x61c fs/gfs2/bmap.c:1159 iomap_iter+0x1d4/0xf20 fs/iomap/iter.c:62 iomap_file_buffered_write+0x430/0x4f0 fs/iomap/buffered-io.c:814 gfs2_file_buffered_write+0x3d0/0x880 fs/gfs2/file.c:1058 gfs2_file_write_iter+0x39c/0xbd8 fs/gfs2/file.c:1166 call_write_iter include/linux/fs.h:2172 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x7c8/0xa2c fs/read_write.c:594 ksys_write+0x120/0x210 fs/read_write.c:647 __do_sys_write fs/read_write.c:659 [inline] __se_sys_write fs/read_write.c:656 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:656 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 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.1.26/4195: #0: ffff0000dac88870 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x170 fs/file.c:1058 #1: ffff0000dac54460 (sb_writers#15){.+.+}-{0:0}, at: vfs_write+0x228/0xa2c fs/read_write.c:590 #2: ffff0000e927d2b0 (&sb->s_type->i_mutex_key#22){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #2: ffff0000e927d2b0 (&sb->s_type->i_mutex_key#22){+.+.}-{3:3}, at: gfs2_file_write_iter+0x28c/0xbd8 fs/gfs2/file.c:1123 #3: ffff0000dac54650 (sb_internal#3){.+.+}-{0:0}, at: gfs2_trans_begin+0x120/0x1bc fs/gfs2/trans.c:118 #4: ffff0000d67d90a8 (&sdp->sd_log_flush_lock){.+.+}-{3:3}, at: __gfs2_trans_begin+0x558/0x8fc fs/gfs2/trans.c:87 #5: ffff0000e927d748 (&ip->i_rw_mutex){++++}-{3:3}, at: sweep_bh_for_rgrps fs/gfs2/bmap.c:1514 [inline] #5: ffff0000e927d748 (&ip->i_rw_mutex){++++}-{3:3}, at: punch_hole+0x1d94/0x2cb0 fs/gfs2/bmap.c:1839 stack backtrace: CPU: 0 PID: 4195 Comm: syz.1.26 Not tainted 5.15.184-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call trace: dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2011 check_noncircular+0x240/0x2d4 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+0x2928/0x651c kernel/locking/lockdep.c:5012 lock_acquire+0x1f4/0x620 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x194/0x1edc kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0xac/0x11c kernel/locking/mutex.c:743 do_qc+0xbc/0x690 fs/gfs2/quota.c:678 gfs2_quota_change+0x238/0x718 fs/gfs2/quota.c:1295 punch_hole+0x27e4/0x2cb0 fs/gfs2/bmap.c:1940 gfs2_iomap_end+0x43c/0x61c fs/gfs2/bmap.c:1159 iomap_iter+0x1d4/0xf20 fs/iomap/iter.c:62 iomap_file_buffered_write+0x430/0x4f0 fs/iomap/buffered-io.c:814 gfs2_file_buffered_write+0x3d0/0x880 fs/gfs2/file.c:1058 gfs2_file_write_iter+0x39c/0xbd8 fs/gfs2/file.c:1166 call_write_iter include/linux/fs.h:2172 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x7c8/0xa2c fs/read_write.c:594 ksys_write+0x120/0x210 fs/read_write.c:647 __do_sys_write fs/read_write.c:659 [inline] __se_sys_write fs/read_write.c:656 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:656 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584