loop0: detected capacity change from 0 to 65536 XFS (loop0): Mounting V5 Filesystem 6653b971-41ab-480a-bd7b-5ff79b9409b5 XFS (loop0): Ending clean mount ====================================================== WARNING: possible circular locking dependency detected 6.14.0-rc1-syzkaller #0 Not tainted ------------------------------------------------------ syz.0.0/5319 is trying to acquire lock: ffff888043ffe120 (&bp->b_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] ffff888043ffe120 (&bp->b_lock){+.+.}-{3:3}, at: xfs_buf_try_hold fs/xfs/xfs_buf.c:578 [inline] ffff888043ffe120 (&bp->b_lock){+.+.}-{3:3}, at: xfs_buf_find_insert+0x1123/0x1610 fs/xfs/xfs_buf.c:663 but task is already holding lock: ffff88805468e180 (&bch->bc_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] ffff88805468e180 (&bch->bc_lock){+.+.}-{3:3}, at: xfs_buf_find_insert+0x3da/0x1610 fs/xfs/xfs_buf.c:655 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&bch->bc_lock){+.+.}-{3:3}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] xfs_buf_rele_cached fs/xfs/xfs_buf.c:1093 [inline] xfs_buf_rele+0x2bf/0x1660 fs/xfs/xfs_buf.c:1147 xfs_imap_lookup+0x26a/0x750 fs/xfs/libxfs/xfs_ialloc.c:2431 xfs_imap+0x54d/0x1090 fs/xfs/libxfs/xfs_ialloc.c:2514 xfs_iget_cache_miss fs/xfs/xfs_icache.c:644 [inline] xfs_iget+0xaf6/0x2ec0 fs/xfs/xfs_icache.c:806 xfs_mountfs+0x14b0/0x24e0 fs/xfs/xfs_mount.c:933 xfs_fs_fill_super+0x121d/0x1540 fs/xfs/xfs_super.c:1813 get_tree_bdev_flags+0x48c/0x5c0 fs/super.c:1636 vfs_get_tree+0x90/0x2b0 fs/super.c:1814 do_new_mount+0x2be/0xb40 fs/namespace.c:3560 do_mount fs/namespace.c:3900 [inline] __do_sys_mount fs/namespace.c:4111 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&bp->b_lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] xfs_buf_try_hold fs/xfs/xfs_buf.c:578 [inline] xfs_buf_find_insert+0x1123/0x1610 fs/xfs/xfs_buf.c:663 xfs_buf_get_map+0x149a/0x1ac0 fs/xfs/xfs_buf.c:754 xfs_buf_read_map+0x110/0xa50 fs/xfs/xfs_buf.c:862 xfs_trans_read_buf_map+0x260/0xab0 fs/xfs/xfs_trans_buf.c:304 xfs_trans_read_buf fs/xfs/xfs_trans.h:212 [inline] xfs_read_agf+0x2dc/0x630 fs/xfs/libxfs/xfs_alloc.c:3378 xfs_alloc_read_agf+0x196/0xbe0 fs/xfs/libxfs/xfs_alloc.c:3413 xfs_bmap_longest_free_extent fs/xfs/libxfs/xfs_bmap.c:3308 [inline] xfs_bmap_btalloc_select_lengths fs/xfs/libxfs/xfs_bmap.c:3371 [inline] xfs_bmap_btalloc_best_length fs/xfs/libxfs/xfs_bmap.c:3746 [inline] xfs_bmap_btalloc fs/xfs/libxfs/xfs_bmap.c:3808 [inline] xfs_bmapi_allocate+0x13b6/0x35f0 fs/xfs/libxfs/xfs_bmap.c:4221 xfs_bmapi_convert_one_delalloc fs/xfs/libxfs/xfs_bmap.c:4730 [inline] xfs_bmapi_convert_delalloc+0x9ae/0x1a30 fs/xfs/libxfs/xfs_bmap.c:4786 xfs_map_blocks+0x7b7/0x1040 fs/xfs/xfs_aops.c:363 iomap_writepage_map_blocks fs/iomap/buffered-io.c:1857 [inline] iomap_writepage_map fs/iomap/buffered-io.c:2007 [inline] iomap_writepages+0x1062/0x31a0 fs/iomap/buffered-io.c:2061 xfs_vm_writepages+0xfc/0x150 fs/xfs/xfs_aops.c:477 do_writepages+0x35f/0x880 mm/page-writeback.c:2687 filemap_fdatawrite_wbc mm/filemap.c:389 [inline] __filemap_fdatawrite_range mm/filemap.c:422 [inline] file_write_and_wait_range+0x2a3/0x3c0 mm/filemap.c:797 xfs_file_fsync+0x1d3/0xa80 fs/xfs/xfs_file.c:138 generic_write_sync include/linux/fs.h:2958 [inline] xfs_file_buffered_write+0x9c0/0xb20 fs/xfs/xfs_file.c:829 do_iter_readv_writev+0x71a/0x9d0 vfs_writev+0x38b/0xbc0 fs/read_write.c:1050 do_pwritev fs/read_write.c:1146 [inline] __do_sys_pwritev2 fs/read_write.c:1204 [inline] __se_sys_pwritev2+0x196/0x2b0 fs/read_write.c:1195 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&bch->bc_lock); lock(&bp->b_lock); lock(&bch->bc_lock); lock(&bp->b_lock); *** DEADLOCK *** 4 locks held by syz.0.0/5319: #0: ffff8880546de420 (sb_writers#13){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3023 [inline] #0: ffff8880546de420 (sb_writers#13){.+.+}-{0:0}, at: vfs_writev+0x2d6/0xbc0 fs/read_write.c:1048 #1: ffff8880546de610 (sb_internal#2){.+.+}-{0:0}, at: xfs_bmapi_convert_one_delalloc fs/xfs/libxfs/xfs_bmap.c:4660 [inline] #1: ffff8880546de610 (sb_internal#2){.+.+}-{0:0}, at: xfs_bmapi_convert_delalloc+0x33f/0x1a30 fs/xfs/libxfs/xfs_bmap.c:4786 #2: ffff888053012018 (&xfs_nondir_ilock_class#2){++++}-{4:4}, at: xfs_bmapi_convert_one_delalloc fs/xfs/libxfs/xfs_bmap.c:4665 [inline] #2: ffff888053012018 (&xfs_nondir_ilock_class#2){++++}-{4:4}, at: xfs_bmapi_convert_delalloc+0x366/0x1a30 fs/xfs/libxfs/xfs_bmap.c:4786 #3: ffff88805468e180 (&bch->bc_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] #3: ffff88805468e180 (&bch->bc_lock){+.+.}-{3:3}, at: xfs_buf_find_insert+0x3da/0x1610 fs/xfs/xfs_buf.c:655 stack backtrace: CPU: 0 UID: 0 PID: 5319 Comm: syz.0.0 Not tainted 6.14.0-rc1-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2076 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2208 check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] xfs_buf_try_hold fs/xfs/xfs_buf.c:578 [inline] xfs_buf_find_insert+0x1123/0x1610 fs/xfs/xfs_buf.c:663 xfs_buf_get_map+0x149a/0x1ac0 fs/xfs/xfs_buf.c:754 xfs_buf_read_map+0x110/0xa50 fs/xfs/xfs_buf.c:862 xfs_trans_read_buf_map+0x260/0xab0 fs/xfs/xfs_trans_buf.c:304 xfs_trans_read_buf fs/xfs/xfs_trans.h:212 [inline] xfs_read_agf+0x2dc/0x630 fs/xfs/libxfs/xfs_alloc.c:3378 xfs_alloc_read_agf+0x196/0xbe0 fs/xfs/libxfs/xfs_alloc.c:3413 xfs_bmap_longest_free_extent fs/xfs/libxfs/xfs_bmap.c:3308 [inline] xfs_bmap_btalloc_select_lengths fs/xfs/libxfs/xfs_bmap.c:3371 [inline] xfs_bmap_btalloc_best_length fs/xfs/libxfs/xfs_bmap.c:3746 [inline] xfs_bmap_btalloc fs/xfs/libxfs/xfs_bmap.c:3808 [inline] xfs_bmapi_allocate+0x13b6/0x35f0 fs/xfs/libxfs/xfs_bmap.c:4221 xfs_bmapi_convert_one_delalloc fs/xfs/libxfs/xfs_bmap.c:4730 [inline] xfs_bmapi_convert_delalloc+0x9ae/0x1a30 fs/xfs/libxfs/xfs_bmap.c:4786 xfs_map_blocks+0x7b7/0x1040 fs/xfs/xfs_aops.c:363 iomap_writepage_map_blocks fs/iomap/buffered-io.c:1857 [inline] iomap_writepage_map fs/iomap/buffered-io.c:2007 [inline] iomap_writepages+0x1062/0x31a0 fs/iomap/buffered-io.c:2061 xfs_vm_writepages+0xfc/0x150 fs/xfs/xfs_aops.c:477 do_writepages+0x35f/0x880 mm/page-writeback.c:2687 filemap_fdatawrite_wbc mm/filemap.c:389 [inline] __filemap_fdatawrite_range mm/filemap.c:422 [inline] file_write_and_wait_range+0x2a3/0x3c0 mm/filemap.c:797 xfs_file_fsync+0x1d3/0xa80 fs/xfs/xfs_file.c:138 generic_write_sync include/linux/fs.h:2958 [inline] xfs_file_buffered_write+0x9c0/0xb20 fs/xfs/xfs_file.c:829 do_iter_readv_writev+0x71a/0x9d0 vfs_writev+0x38b/0xbc0 fs/read_write.c:1050 do_pwritev fs/read_write.c:1146 [inline] __do_sys_pwritev2 fs/read_write.c:1204 [inline] __se_sys_pwritev2+0x196/0x2b0 fs/read_write.c:1195 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f89c738cda9 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:00007f89c825b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 00007f89c75a5fa0 RCX: 00007f89c738cda9 RDX: 0000000000000001 RSI: 00000000200001c0 RDI: 0000000000000005 RBP: 00007f89c740e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000e7b R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f89c75a5fa0 R15: 00007ffc50040378