loop0: detected capacity change from 0 to 32768 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.0.0/5323 is trying to acquire lock: ffff88805589ee18 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_reclaim_inode fs/xfs/xfs_icache.c:1035 [inline] ffff88805589ee18 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1727 [inline] ffff88805589ee18 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_icwalk_ag+0x1259/0x1b40 fs/xfs/xfs_icache.c:1809 but task is already holding lock: ffff88805589df18 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_ilock_for_iomap fs/xfs/xfs_iomap.c:789 [inline] ffff88805589df18 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_buffered_write_iomap_begin+0x53a/0x1ca0 fs/xfs/xfs_iomap.c:1793 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 4 locks held by syz.0.0/5323: #0: ffff8880328aa420 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2710 [inline] #0: ffff8880328aa420 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x227/0xb90 fs/read_write.c:684 #1: ffff88805589e130 (&sb->s_type->i_mutex_key#25){++++}-{4:4}, at: xfs_ilock+0xee/0x3b0 fs/xfs/xfs_inode.c:149 #2: ffff88805589df18 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_ilock_for_iomap fs/xfs/xfs_iomap.c:789 [inline] #2: ffff88805589df18 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_buffered_write_iomap_begin+0x53a/0x1ca0 fs/xfs/xfs_iomap.c:1793 #3: ffff8880328aa0e0 (&type->s_umount_key#52){.+.+}-{4:4}, at: super_trylock_shared fs/super.c:565 [inline] #3: ffff8880328aa0e0 (&type->s_umount_key#52){.+.+}-{4:4}, at: super_cache_scan+0x91/0x4b0 fs/super.c:198 stack backtrace: CPU: 0 UID: 0 PID: 5323 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+0x279/0x290 kernel/locking/lockdep.c:3041 check_deadlock kernel/locking/lockdep.c:3093 [inline] validate_chain kernel/locking/lockdep.c:3895 [inline] __lock_acquire+0x253f/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868 down_write_nested+0x9d/0x210 kernel/locking/rwsem.c:1706 xfs_reclaim_inode fs/xfs/xfs_icache.c:1035 [inline] xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1727 [inline] xfs_icwalk_ag+0x1259/0x1b40 fs/xfs/xfs_icache.c:1809 xfs_icwalk fs/xfs/xfs_icache.c:1857 [inline] xfs_reclaim_inodes_nr+0x1e5/0x260 fs/xfs/xfs_icache.c:1101 super_cache_scan+0x41b/0x4b0 fs/super.c:229 do_shrink_slab+0x6df/0x1170 mm/shrinker.c:437 shrink_slab+0xdf2/0x1150 mm/shrinker.c:664 shrink_one+0x2d9/0x710 mm/vmscan.c:4918 shrink_many mm/vmscan.c:4979 [inline] lru_gen_shrink_node mm/vmscan.c:5057 [inline] shrink_node+0x30e2/0x39d0 mm/vmscan.c:6037 shrink_zones mm/vmscan.c:6290 [inline] do_try_to_free_pages+0x6a2/0x1980 mm/vmscan.c:6352 try_to_free_pages+0x8f2/0xe90 mm/vmscan.c:6591 __perform_reclaim mm/page_alloc.c:4423 [inline] __alloc_pages_direct_reclaim+0x148/0x310 mm/page_alloc.c:4445 __alloc_pages_slowpath+0x57d/0xd40 mm/page_alloc.c:4845 __alloc_frozen_pages_noprof+0x322/0x380 mm/page_alloc.c:5262 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2485 alloc_frozen_pages_noprof mm/mempolicy.c:2556 [inline] alloc_pages_noprof+0xa8/0x190 mm/mempolicy.c:2576 stack_depot_save_flags+0x73c/0x810 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] __do_kmalloc_node mm/slub.c:5177 [inline] __kmalloc_node_track_caller_noprof+0x4db/0x7b0 mm/slub.c:5285 __do_krealloc mm/slub.c:6546 [inline] krealloc_node_align_noprof+0x1ae/0x390 mm/slub.c:6605 xfs_iext_realloc_root fs/xfs/libxfs/xfs_iext_tree.c:613 [inline] xfs_iext_insert_raw+0x13c/0x3270 fs/xfs/libxfs/xfs_iext_tree.c:647 xfs_iext_insert+0x36/0x260 fs/xfs/libxfs/xfs_iext_tree.c:684 xfs_bmap_add_extent_hole_delay+0x4e8/0x850 fs/xfs/xfs_iomap.c:1429 xfs_bmapi_reserve_delalloc+0xc98/0xde0 fs/xfs/xfs_iomap.c:1548 xfs_buffered_write_iomap_begin+0x1362/0x1ca0 fs/xfs/xfs_iomap.c:1986 iomap_iter+0x600/0x1020 fs/iomap/iter.c:110 iomap_file_buffered_write+0x252/0xb30 fs/iomap/buffered-io.c:1210 xfs_file_buffered_write+0x212/0x8c0 fs/xfs/xfs_file.c:1013 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x61d/0xb90 fs/read_write.c:688 ksys_pwrite64 fs/read_write.c:795 [inline] __do_sys_pwrite64 fs/read_write.c:803 [inline] __se_sys_pwrite64 fs/read_write.c:800 [inline] __x64_sys_pwrite64+0x199/0x230 fs/read_write.c:800 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd303b9bf79 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:00007fd304a37028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012 RAX: ffffffffffffffda RBX: 00007fd303e15fa0 RCX: 00007fd303b9bf79 RDX: 0000000000000001 RSI: 0000200000000140 RDI: 0000000000000004 RBP: 00007fd303c327e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000008000c61 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd303e16038 R14: 00007fd303e15fa0 R15: 00007ffec44f2688 syz.0.0 (5323) used greatest stack depth: 16032 bytes left