====================================================== WARNING: possible circular locking dependency detected 6.1.119-syzkaller #0 Not tainted ------------------------------------------------------ syz.6.199/5169 is trying to acquire lock: ffff0000f0f54ae0 (&sdp->sd_quota_mutex){+.+.}-{3:3}, at: do_qc+0xbc/0x664 fs/gfs2/quota.c:682 but task is already holding lock: ffff0000e0f34fd0 (&ip->i_rw_mutex){++++}-{3:3}, at: __gfs2_iomap_alloc+0x210/0x17a0 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}: down_read+0x64/0x308 kernel/locking/rwsem.c:1520 __gfs2_iomap_get+0x138/0x1058 fs/gfs2/bmap.c:856 gfs2_iomap_get+0xd8/0x154 fs/gfs2/bmap.c:1396 bh_get+0x208/0x6ac fs/gfs2/quota.c:385 qdsb_get+0x1e0/0x398 fs/gfs2/quota.c:522 gfs2_quota_hold+0x16c/0x558 fs/gfs2/quota.c:608 gfs2_quota_lock+0xbc/0x404 fs/gfs2/quota.c:1076 gfs2_quota_lock_check fs/gfs2/quota.h:50 [inline] do_grow fs/gfs2/bmap.c:2063 [inline] gfs2_setattr_size+0x318/0x6e0 fs/gfs2/bmap.c:2138 gfs2_setattr+0x234/0x3ac fs/gfs2/inode.c:2002 notify_change+0xb58/0xe1c fs/attr.c:499 do_truncate+0x1c0/0x28c fs/open.c:65 do_sys_ftruncate+0x288/0x31c fs/open.c:193 __do_sys_ftruncate fs/open.c:204 [inline] __se_sys_ftruncate fs/open.c:202 [inline] __arm64_sys_ftruncate+0x60/0x74 fs/open.c:202 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #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+0x3338/0x7680 kernel/locking/lockdep.c:5049 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662 __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 do_qc+0xbc/0x664 fs/gfs2/quota.c:682 gfs2_quota_change+0x238/0x718 fs/gfs2/quota.c:1295 gfs2_alloc_blocks+0x174c/0x207c fs/gfs2/rgrp.c:2494 __gfs2_iomap_alloc+0x3b8/0x17a0 fs/gfs2/bmap.c:705 gfs2_iomap_alloc+0x138/0x1d0 fs/gfs2/bmap.c:1409 gfs2_allocate_page_backing+0x10c/0x204 fs/gfs2/file.c:394 gfs2_page_mkwrite+0x12c4/0x179c fs/gfs2/file.c:524 do_page_mkwrite+0x144/0x37c mm/memory.c:3009 do_shared_fault mm/memory.c:4694 [inline] do_fault mm/memory.c:4762 [inline] handle_pte_fault mm/memory.c:5029 [inline] __handle_mm_fault mm/memory.c:5171 [inline] handle_mm_fault+0x1824/0x3d38 mm/memory.c:5292 fixup_user_fault+0x160/0x348 mm/gup.c:1365 fault_in_safe_writeable+0x118/0x22c mm/gup.c:1861 fault_in_iov_iter_writeable+0xcc/0x22c lib/iov_iter.c:399 gfs2_file_read_iter+0x85c/0xb18 fs/gfs2/file.c:992 call_read_iter include/linux/fs.h:2259 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x5bc/0x8b4 fs/read_write.c:470 ksys_read+0x15c/0x26c fs/read_write.c:613 __do_sys_read fs/read_write.c:623 [inline] __se_sys_read fs/read_write.c:621 [inline] __arm64_sys_read+0x7c/0x90 fs/read_write.c:621 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 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.6.199/5169: #0: ffff0000dac64fe8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x124/0x16c fs/file.c:1031 #1: ffff0000d020f948 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:117 [inline] #1: ffff0000d020f948 (&mm->mmap_lock){++++}-{3:3}, at: fixup_user_fault+0x1ac/0x348 mm/gup.c:1387 #2: ffff0000d6766558 (sb_pagefaults#2){.+.+}-{0:0}, at: do_page_mkwrite+0x144/0x37c mm/memory.c:3009 #3: ffff0000d6766650 (sb_internal#4){.+.+}-{0:0}, at: gfs2_trans_begin+0xa8/0x11c fs/gfs2/trans.c:118 #4: ffff0000f0f55058 (&sdp->sd_log_flush_lock){.+.+}-{3:3}, at: __gfs2_trans_begin+0x524/0x91c fs/gfs2/trans.c:87 #5: ffff0000e0f34fd0 (&ip->i_rw_mutex){++++}-{3:3}, at: __gfs2_iomap_alloc+0x210/0x17a0 fs/gfs2/bmap.c:679 stack backtrace: CPU: 1 PID: 5169 Comm: syz.6.199 Not tainted 6.1.119-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 dump_stack+0x1c/0x58 lib/dump_stack.c:113 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2048 check_noncircular+0x2cc/0x378 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+0x3338/0x7680 kernel/locking/lockdep.c:5049 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662 __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 do_qc+0xbc/0x664 fs/gfs2/quota.c:682 gfs2_quota_change+0x238/0x718 fs/gfs2/quota.c:1295 gfs2_alloc_blocks+0x174c/0x207c fs/gfs2/rgrp.c:2494 __gfs2_iomap_alloc+0x3b8/0x17a0 fs/gfs2/bmap.c:705 gfs2_iomap_alloc+0x138/0x1d0 fs/gfs2/bmap.c:1409 gfs2_allocate_page_backing+0x10c/0x204 fs/gfs2/file.c:394 gfs2_page_mkwrite+0x12c4/0x179c fs/gfs2/file.c:524 do_page_mkwrite+0x144/0x37c mm/memory.c:3009 do_shared_fault mm/memory.c:4694 [inline] do_fault mm/memory.c:4762 [inline] handle_pte_fault mm/memory.c:5029 [inline] __handle_mm_fault mm/memory.c:5171 [inline] handle_mm_fault+0x1824/0x3d38 mm/memory.c:5292 fixup_user_fault+0x160/0x348 mm/gup.c:1365 fault_in_safe_writeable+0x118/0x22c mm/gup.c:1861 fault_in_iov_iter_writeable+0xcc/0x22c lib/iov_iter.c:399 gfs2_file_read_iter+0x85c/0xb18 fs/gfs2/file.c:992 call_read_iter include/linux/fs.h:2259 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x5bc/0x8b4 fs/read_write.c:470 ksys_read+0x15c/0x26c fs/read_write.c:613 __do_sys_read fs/read_write.c:623 [inline] __se_sys_read fs/read_write.c:621 [inline] __arm64_sys_read+0x7c/0x90 fs/read_write.c:621 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585