loop0: detected capacity change from 0 to 32768 ======================================================= WARNING: The mand mount option has been deprecated and and is ignored by this kernel. Remove the mand option from the mount to silence this warning. ======================================================= XFS (loop0): Mounting V5 Filesystem bfdc47fc-10d8-4eed-a562-11a831b3f791 XFS (loop0): Ending clean mount XFS (loop0): Quotacheck needed: Please wait. XFS (loop0): Quotacheck: Done. ============================================ WARNING: possible recursive locking detected syzkaller #0 Not tainted -------------------------------------------- syz.0.0/5317 is trying to acquire lock: ffff8880454ea540 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_reclaim_inode fs/xfs/xfs_icache.c:1042 [inline] ffff8880454ea540 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1734 [inline] ffff8880454ea540 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_icwalk_ag+0x12b7/0x1980 fs/xfs/xfs_icache.c:1816 but task is already holding lock: ffff8880454e8100 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_ilock_for_iomap fs/xfs/xfs_iomap.c:792 [inline] ffff8880454e8100 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_buffered_write_iomap_begin+0x674/0x2350 fs/xfs/xfs_iomap.c:1825 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&xfs_nondir_ilock_class); lock(&xfs_nondir_ilock_class); *** DEADLOCK *** May be due to missing lock nesting notation locks held by syz.0.0/5317: 5, last CPU#0: #0: ffff8880120e19b0 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x246/0x320 fs/file.c:1259 #1: ffff88801f936460 (sb_writers#11){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2753 [inline] #1: ffff88801f936460 (sb_writers#11){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 fs/read_write.c:683 #2: ffff8880454e8310 (&sb->s_type->i_mutex_key#23){+.+.}-{4:4}, at: xfs_ilock+0xee/0x380 fs/xfs/xfs_inode.c:149 #3: ffff8880454e8100 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_ilock_for_iomap fs/xfs/xfs_iomap.c:792 [inline] #3: ffff8880454e8100 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_buffered_write_iomap_begin+0x674/0x2350 fs/xfs/xfs_iomap.c:1825 #4: ffff88801f9360e8 (&type->s_umount_key#52){.+.+}-{4:4}, at: super_trylock_shared fs/super.c:688 [inline] #4: ffff88801f9360e8 (&type->s_umount_key#52){.+.+}-{4:4}, at: super_cache_scan+0x94/0x500 fs/super.c:213 stack backtrace: CPU: 0 UID: 0 PID: 5317 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_deadlock_bug+0x27a/0x290 kernel/locking/lockdep.c:3057 check_deadlock kernel/locking/lockdep.c:3109 [inline] validate_chain kernel/locking/lockdep.c:3911 [inline] __lock_acquire+0x261c/0x2e50 kernel/locking/lockdep.c:5254 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5908 down_write_nested+0x9d/0x210 kernel/locking/rwsem.c:1757 xfs_reclaim_inode fs/xfs/xfs_icache.c:1042 [inline] xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1734 [inline] xfs_icwalk_ag+0x12b7/0x1980 fs/xfs/xfs_icache.c:1816 xfs_icwalk fs/xfs/xfs_icache.c:1864 [inline] xfs_reclaim_inodes_nr+0x1e5/0x260 fs/xfs/xfs_icache.c:1108 super_cache_scan+0x476/0x500 fs/super.c:244 do_shrink_slab+0x6d0/0x10e0 mm/shrinker.c:443 shrink_slab+0xea4/0x1220 mm/shrinker.c:674 shrink_one+0x2a2/0x730 mm/vmscan.c:5119 shrink_many mm/vmscan.c:5180 [inline] lru_gen_shrink_node mm/vmscan.c:5258 [inline] shrink_node+0x35d0/0x3e30 mm/vmscan.c:6247 shrink_zones mm/vmscan.c:6503 [inline] do_try_to_free_pages+0x6a3/0x1990 mm/vmscan.c:6565 try_to_free_pages+0x90a/0xe50 mm/vmscan.c:6804 __perform_reclaim mm/page_alloc.c:4451 [inline] __alloc_pages_direct_reclaim+0x17d/0x360 mm/page_alloc.c:4478 __alloc_pages_slowpath+0x64a/0xec0 mm/page_alloc.c:4939 __alloc_frozen_pages_noprof+0x3f3/0x5a0 mm/page_alloc.c:5449 alloc_pages_mpol+0x21e/0x390 mm/mempolicy.c:2486 alloc_frozen_pages_noprof mm/mempolicy.c:2557 [inline] alloc_pages_noprof+0xb1/0x2b0 mm/mempolicy.c:2577 stack_depot_save_flags+0x738/0x7f0 lib/stackdepot.c:685 kasan_save_stack mm/kasan/common.c:58 [inline] kasan_save_track+0x4f/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x321/0x600 mm/slub.c:5563 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] xfs_iext_alloc_node fs/xfs/libxfs/xfs_iext_tree.c:401 [inline] xfs_iext_alloc_root fs/xfs/libxfs/xfs_iext_tree.c:593 [inline] xfs_iext_insert_raw+0x22e/0x30a0 fs/xfs/libxfs/xfs_iext_tree.c:645 xfs_iext_insert+0x36/0x230 fs/xfs/libxfs/xfs_iext_tree.c:684 xfs_bmap_add_extent_hole_delay+0x4e8/0x850 fs/xfs/xfs_iomap.c:1438 xfs_bmapi_reserve_delalloc+0xc60/0xdb0 fs/xfs/xfs_iomap.c:1557 xfs_buffered_write_iomap_begin+0x18da/0x2350 fs/xfs/xfs_iomap.c:2073 iomap_iter_next include/linux/iomap.h:382 [inline] xfs_buffered_write_iomap_next+0x52c/0x740 fs/xfs/xfs_iomap.c:2177 iomap_iter+0xe2/0xec0 fs/iomap/iter.c:122 iomap_file_buffered_write+0x249/0xb90 fs/iomap/buffered-io.c:1312 xfs_file_buffered_write+0x20a/0x870 fs/xfs/xfs_file.c:1064 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x612/0xba0 fs/read_write.c:687 ksys_write+0x150/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f72ab99e159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f72ac7c5fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f72abc25fa0 RCX: 00007f72ab99e159 RDX: 000000000208e24b RSI: 0000200000000000 RDI: 0000000000000006 RBP: 00007f72aba35024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f72abc26038 R14: 00007f72abc25fa0 R15: 00007ffc2e8a3e18