XFS (loop0): Quotacheck: Done. ====================================================== WARNING: possible circular locking dependency detected 6.8.0-syzkaller-06619-ge5e038b7ae9d #0 Not tainted ------------------------------------------------------ syz-executor.0/10539 is trying to acquire lock: ffffffff8d92fb40 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:303 [inline] ffffffff8d92fb40 (fs_reclaim){+.+.}-{0:0}, at: prepare_alloc_pages.constprop.0+0x155/0x560 mm/page_alloc.c:4340 but task is already holding lock: ffff88804a945e18 (&xfs_nondir_ilock_class#3){++++}-{3:3}, at: xfs_ilock+0x2ef/0x3e0 fs/xfs/xfs_inode.c:206 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&xfs_nondir_ilock_class#3){++++}-{3:3}: down_write_nested+0x3d/0x50 kernel/locking/rwsem.c:1695 xfs_ilock+0x2ef/0x3e0 fs/xfs/xfs_inode.c:206 xfs_reclaim_inode fs/xfs/xfs_icache.c:945 [inline] xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1631 [inline] xfs_icwalk_ag+0xca6/0x1740 fs/xfs/xfs_icache.c:1713 xfs_icwalk+0x57/0x100 fs/xfs/xfs_icache.c:1762 xfs_reclaim_inodes_nr+0x182/0x250 fs/xfs/xfs_icache.c:1011 super_cache_scan+0x409/0x550 fs/super.c:227 do_shrink_slab+0x44f/0x1160 mm/shrinker.c:435 shrink_slab_memcg mm/shrinker.c:548 [inline] shrink_slab+0xa87/0x1310 mm/shrinker.c:626 shrink_one+0x493/0x7b0 mm/vmscan.c:4767 shrink_many mm/vmscan.c:4828 [inline] lru_gen_shrink_node mm/vmscan.c:4929 [inline] shrink_node+0x2191/0x3770 mm/vmscan.c:5888 kswapd_shrink_node mm/vmscan.c:6696 [inline] balance_pgdat+0x9d0/0x1a90 mm/vmscan.c:6886 kswapd+0x5c1/0xc10 mm/vmscan.c:7146 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 -> #0 (fs_reclaim){+.+.}-{0:0}: 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+0x2478/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719 __fs_reclaim_acquire mm/page_alloc.c:3692 [inline] fs_reclaim_acquire+0x102/0x150 mm/page_alloc.c:3706 might_alloc include/linux/sched/mm.h:303 [inline] prepare_alloc_pages.constprop.0+0x155/0x560 mm/page_alloc.c:4340 __alloc_pages+0x194/0x2410 mm/page_alloc.c:4558 alloc_pages_mpol+0x258/0x600 mm/mempolicy.c:2133 stack_depot_save_flags+0x568/0x900 lib/stackdepot.c:676 kasan_save_stack+0x42/0x60 mm/kasan/common.c:48 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_krealloc+0x106/0x1c0 mm/kasan/common.c:457 kasan_krealloc include/linux/kasan.h:231 [inline] __do_krealloc mm/slab_common.c:1188 [inline] krealloc+0xa7/0x100 mm/slab_common.c:1225 xfs_iext_realloc_root fs/xfs/libxfs/xfs_iext_tree.c:613 [inline] xfs_iext_insert_raw+0x15a8/0x1e70 fs/xfs/libxfs/xfs_iext_tree.c:647 xfs_iext_insert+0x38/0x220 fs/xfs/libxfs/xfs_iext_tree.c:684 xfs_bmap_add_extent_hole_delay.constprop.0+0x25d/0xb10 fs/xfs/libxfs/xfs_bmap.c:2686 xfs_bmapi_reserve_delalloc+0x427/0x7e0 fs/xfs/libxfs/xfs_bmap.c:4128 xfs_buffered_write_iomap_begin+0x12c2/0x21c0 fs/xfs/xfs_iomap.c:1130 iomap_iter+0x61f/0xff0 fs/iomap/iter.c:91 iomap_file_buffered_write+0x202/0x9c0 fs/iomap/buffered-io.c:1014 xfs_file_buffered_write+0x20a/0xa40 fs/xfs/xfs_file.c:786 xfs_file_write_iter+0x548/0x740 fs/xfs/xfs_file.c:861 call_write_iter include/linux/fs.h:2108 [inline] iter_file_splice_write+0x906/0x10b0 fs/splice.c:743 do_splice_from fs/splice.c:941 [inline] direct_splice_actor+0x19b/0x6d0 fs/splice.c:1164 splice_direct_to_actor+0x346/0xa40 fs/splice.c:1108 do_splice_direct_actor fs/splice.c:1207 [inline] do_splice_direct+0x17e/0x250 fs/splice.c:1233 do_sendfile+0xaa8/0xdb0 fs/read_write.c:1295 __do_compat_sys_sendfile fs/read_write.c:1383 [inline] __se_compat_sys_sendfile fs/read_write.c:1366 [inline] __ia32_compat_sys_sendfile+0x1e7/0x230 fs/read_write.c:1366 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x7a/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7a/0x84 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&xfs_nondir_ilock_class#3); lock(fs_reclaim); lock(&xfs_nondir_ilock_class#3); lock(fs_reclaim); *** DEADLOCK *** 3 locks held by syz-executor.0/10539: #0: ffff88804e5f0420 (sb_writers#15){.+.+}-{0:0}, at: splice_direct_to_actor+0x346/0xa40 fs/splice.c:1108 #1: ffff88804a946038 (&sb->s_type->i_mutex_key#23){++++}-{3:3}, at: xfs_ilock+0x351/0x3e0 fs/xfs/xfs_inode.c:190 #2: ffff88804a945e18 (&xfs_nondir_ilock_class#3){++++}-{3:3}, at: xfs_ilock+0x2ef/0x3e0 fs/xfs/xfs_inode.c:206 stack backtrace: CPU: 1 PID: 10539 Comm: syz-executor.0 Not tainted 6.8.0-syzkaller-06619-ge5e038b7ae9d #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 check_noncircular+0x31a/0x400 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+0x2478/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719 __fs_reclaim_acquire mm/page_alloc.c:3692 [inline] fs_reclaim_acquire+0x102/0x150 mm/page_alloc.c:3706 might_alloc include/linux/sched/mm.h:303 [inline] prepare_alloc_pages.constprop.0+0x155/0x560 mm/page_alloc.c:4340 __alloc_pages+0x194/0x2410 mm/page_alloc.c:4558 alloc_pages_mpol+0x258/0x600 mm/mempolicy.c:2133 stack_depot_save_flags+0x568/0x900 lib/stackdepot.c:676 kasan_save_stack+0x42/0x60 mm/kasan/common.c:48 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_krealloc+0x106/0x1c0 mm/kasan/common.c:457 kasan_krealloc include/linux/kasan.h:231 [inline] __do_krealloc mm/slab_common.c:1188 [inline] krealloc+0xa7/0x100 mm/slab_common.c:1225 xfs_iext_realloc_root fs/xfs/libxfs/xfs_iext_tree.c:613 [inline] xfs_iext_insert_raw+0x15a8/0x1e70 fs/xfs/libxfs/xfs_iext_tree.c:647 xfs_iext_insert+0x38/0x220 fs/xfs/libxfs/xfs_iext_tree.c:684 xfs_bmap_add_extent_hole_delay.constprop.0+0x25d/0xb10 fs/xfs/libxfs/xfs_bmap.c:2686 xfs_bmapi_reserve_delalloc+0x427/0x7e0 fs/xfs/libxfs/xfs_bmap.c:4128 xfs_buffered_write_iomap_begin+0x12c2/0x21c0 fs/xfs/xfs_iomap.c:1130 iomap_iter+0x61f/0xff0 fs/iomap/iter.c:91 iomap_file_buffered_write+0x202/0x9c0 fs/iomap/buffered-io.c:1014 xfs_file_buffered_write+0x20a/0xa40 fs/xfs/xfs_file.c:786 xfs_file_write_iter+0x548/0x740 fs/xfs/xfs_file.c:861 call_write_iter include/linux/fs.h:2108 [inline] iter_file_splice_write+0x906/0x10b0 fs/splice.c:743 do_splice_from fs/splice.c:941 [inline] direct_splice_actor+0x19b/0x6d0 fs/splice.c:1164 splice_direct_to_actor+0x346/0xa40 fs/splice.c:1108 do_splice_direct_actor fs/splice.c:1207 [inline] do_splice_direct+0x17e/0x250 fs/splice.c:1233 do_sendfile+0xaa8/0xdb0 fs/read_write.c:1295 __do_compat_sys_sendfile fs/read_write.c:1383 [inline] __se_compat_sys_sendfile fs/read_write.c:1366 [inline] __ia32_compat_sys_sendfile+0x1e7/0x230 fs/read_write.c:1366 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x7a/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7a/0x84 RIP: 0023:0xf72ad579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f5ea75ac EFLAGS: 00000292 ORIG_RAX: 00000000000000bb RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 0000000000000006 RDX: 0000000000000000 RSI: 0000000000201005 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi