====================================================== WARNING: possible circular locking dependency detected 6.10.0-rc7-syzkaller-gc912bf709078 #0 Not tainted ------------------------------------------------------ syz.1.59/6805 is trying to acquire lock: ffff0000f4becae8 (&sdp->sd_quota_mutex){+.+.}-{3:3}, at: do_qc+0xac/0x5c8 fs/gfs2/quota.c:720 but task is already holding lock: ffff0000dfe01358 (&ip->i_rw_mutex){++++}-{3:3}, at: __gfs2_iomap_alloc+0x210/0x179c fs/gfs2/bmap.c:682 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+0x58/0x2fc kernel/locking/rwsem.c:1526 __gfs2_iomap_get+0x124/0x102c fs/gfs2/bmap.c:859 gfs2_iomap_get+0xd8/0x154 fs/gfs2/bmap.c:1413 bh_get+0x1ec/0x688 fs/gfs2/quota.c:417 qdsb_get+0x1c8/0x30c fs/gfs2/quota.c:566 gfs2_quota_hold+0x16c/0x560 fs/gfs2/quota.c:646 gfs2_quota_lock+0xb8/0x400 fs/gfs2/quota.c:1103 gfs2_quota_lock_check fs/gfs2/quota.h:50 [inline] do_grow fs/gfs2/bmap.c:2071 [inline] gfs2_setattr_size+0x5ec/0xdc8 fs/gfs2/bmap.c:2146 gfs2_setattr+0x218/0x390 fs/gfs2/inode.c:2025 notify_change+0x9d4/0xc84 fs/attr.c:497 do_truncate fs/open.c:65 [inline] do_ftruncate+0x3e4/0x4cc fs/open.c:181 do_sys_ftruncate fs/open.c:199 [inline] __do_sys_ftruncate fs/open.c:207 [inline] __se_sys_ftruncate fs/open.c:205 [inline] __arm64_sys_ftruncate+0x94/0xec fs/open.c:205 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:131 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:150 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 -> #0 (&sdp->sd_quota_mutex){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x3384/0x763c kernel/locking/lockdep.c:5137 lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5754 __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:608 __mutex_lock kernel/locking/mutex.c:752 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804 do_qc+0xac/0x5c8 fs/gfs2/quota.c:720 gfs2_quota_change+0x238/0x728 fs/gfs2/quota.c:1315 gfs2_alloc_blocks+0x172c/0x2044 fs/gfs2/rgrp.c:2496 __gfs2_iomap_alloc+0x3b4/0x179c fs/gfs2/bmap.c:708 gfs2_iomap_alloc+0x138/0x1d0 fs/gfs2/bmap.c:1426 gfs2_allocate_folio_backing+0x104/0x1f8 fs/gfs2/file.c:395 gfs2_page_mkwrite+0x140c/0x1950 fs/gfs2/file.c:526 do_page_mkwrite+0x140/0x2dc mm/memory.c:3093 do_shared_fault mm/memory.c:4993 [inline] do_fault mm/memory.c:5055 [inline] do_pte_missing mm/memory.c:3897 [inline] handle_pte_fault+0x11e4/0x5714 mm/memory.c:5381 __handle_mm_fault mm/memory.c:5524 [inline] handle_mm_fault+0xe84/0x15cc mm/memory.c:5689 fixup_user_fault+0x200/0x548 mm/gup.c:1753 fault_in_safe_writeable+0x118/0x22c mm/gup.c:2304 fault_in_iov_iter_writeable+0x130/0x22c lib/iov_iter.c:151 gfs2_file_read_iter+0x82c/0xaec fs/gfs2/file.c:997 do_iter_readv_writev+0x438/0x658 vfs_readv+0x238/0x844 fs/read_write.c:932 do_preadv fs/read_write.c:1049 [inline] __do_sys_preadv fs/read_write.c:1099 [inline] __se_sys_preadv fs/read_write.c:1094 [inline] __arm64_sys_preadv+0x18c/0x29c fs/read_write.c:1094 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:131 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:150 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 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.1.59/6805: #0: ffff0000dc0f8988 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:144 [inline] #0: ffff0000dc0f8988 (&mm->mmap_lock){++++}-{3:3}, at: fault_in_safe_writeable+0xf8/0x22c mm/gup.c:2302 #1: ffff0000d6ffc518 (sb_pagefaults#2){.+.+}-{0:0}, at: do_page_mkwrite+0x140/0x2dc mm/memory.c:3093 #2: ffff0000d6ffc610 (sb_internal#3){.+.+}-{0:0}, at: gfs2_trans_begin+0x8c/0x100 fs/gfs2/trans.c:118 #3: ffff0000f4bed060 (&sdp->sd_log_flush_lock){.+.+}-{3:3}, at: __gfs2_trans_begin+0x510/0x908 fs/gfs2/trans.c:87 #4: ffff0000dfe01358 (&ip->i_rw_mutex){++++}-{3:3}, at: __gfs2_iomap_alloc+0x210/0x179c fs/gfs2/bmap.c:682 stack backtrace: CPU: 0 PID: 6805 Comm: syz.1.59 Not tainted 6.10.0-rc7-syzkaller-gc912bf709078 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:114 dump_stack+0x1c/0x28 lib/dump_stack.c:123 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2060 check_noncircular+0x310/0x404 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x3384/0x763c kernel/locking/lockdep.c:5137 lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5754 __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:608 __mutex_lock kernel/locking/mutex.c:752 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804 do_qc+0xac/0x5c8 fs/gfs2/quota.c:720 gfs2_quota_change+0x238/0x728 fs/gfs2/quota.c:1315 gfs2_alloc_blocks+0x172c/0x2044 fs/gfs2/rgrp.c:2496 __gfs2_iomap_alloc+0x3b4/0x179c fs/gfs2/bmap.c:708 gfs2_iomap_alloc+0x138/0x1d0 fs/gfs2/bmap.c:1426 gfs2_allocate_folio_backing+0x104/0x1f8 fs/gfs2/file.c:395 gfs2_page_mkwrite+0x140c/0x1950 fs/gfs2/file.c:526 do_page_mkwrite+0x140/0x2dc mm/memory.c:3093 do_shared_fault mm/memory.c:4993 [inline] do_fault mm/memory.c:5055 [inline] do_pte_missing mm/memory.c:3897 [inline] handle_pte_fault+0x11e4/0x5714 mm/memory.c:5381 __handle_mm_fault mm/memory.c:5524 [inline] handle_mm_fault+0xe84/0x15cc mm/memory.c:5689 fixup_user_fault+0x200/0x548 mm/gup.c:1753 fault_in_safe_writeable+0x118/0x22c mm/gup.c:2304 fault_in_iov_iter_writeable+0x130/0x22c lib/iov_iter.c:151 gfs2_file_read_iter+0x82c/0xaec fs/gfs2/file.c:997 do_iter_readv_writev+0x438/0x658 vfs_readv+0x238/0x844 fs/read_write.c:932 do_preadv fs/read_write.c:1049 [inline] __do_sys_preadv fs/read_write.c:1099 [inline] __se_sys_preadv fs/read_write.c:1094 [inline] __arm64_sys_preadv+0x18c/0x29c fs/read_write.c:1094 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:131 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:150 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598