ext4 filesystem being mounted at /syzkaller-testdir3138044427/syzkaller.n0ylJN/804/file0 supports timestamps until 2038-01-19 (0x7fffffff) ====================================================== WARNING: possible circular locking dependency detected 6.6.0-syzkaller-16201-gb57b17e88bf5 #0 Not tainted ------------------------------------------------------ syz-executor.1/13825 is trying to acquire lock: ffffffff8d11d1a0 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:303 [inline] ffffffff8d11d1a0 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slab.h:710 [inline] ffffffff8d11d1a0 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:3460 [inline] ffffffff8d11d1a0 (fs_reclaim){+.+.}-{0:0}, at: __kmem_cache_alloc_node+0x51/0x310 mm/slub.c:3517 but task is already holding lock: ffff888079acdac8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] ffff888079acdac8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_set_handle+0x159/0x1420 fs/ext4/xattr.c:2371 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&ei->xattr_sem){++++}-{3:3}: down_write+0x93/0x200 kernel/locking/rwsem.c:1579 ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] ext4_xattr_set_handle+0x159/0x1420 fs/ext4/xattr.c:2371 ext4_xattr_set+0x149/0x370 fs/ext4/xattr.c:2558 __vfs_setxattr+0x173/0x1d0 fs/xattr.c:201 __vfs_setxattr_noperm+0x127/0x5e0 fs/xattr.c:235 __vfs_setxattr_locked+0x17e/0x250 fs/xattr.c:296 vfs_setxattr+0x146/0x350 fs/xattr.c:322 do_setxattr+0x142/0x170 fs/xattr.c:630 setxattr+0x159/0x170 fs/xattr.c:653 path_setxattr+0x175/0x1d0 fs/xattr.c:672 __do_sys_lsetxattr fs/xattr.c:695 [inline] __se_sys_lsetxattr fs/xattr.c:691 [inline] __ia32_sys_lsetxattr+0xbd/0x150 fs/xattr.c:691 do_syscall_32_irqs_on arch/x86/entry/common.c:164 [inline] __do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:230 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:255 entry_SYSENTER_compat_after_hwframe+0x70/0x7a -> #2 (jbd2_handle){++++}-{0:0}: start_this_handle+0x10fc/0x15e0 fs/jbd2/transaction.c:463 jbd2__journal_start+0x391/0x690 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x40f/0x5c0 fs/ext4/ext4_jbd2.c:112 ext4_sample_last_mounted fs/ext4/file.c:835 [inline] ext4_file_open+0x632/0xc80 fs/ext4/file.c:864 do_dentry_open+0x8d4/0x18d0 fs/open.c:948 do_open fs/namei.c:3622 [inline] path_openat+0x1d4e/0x2c40 fs/namei.c:3779 do_filp_open+0x1de/0x430 fs/namei.c:3809 do_sys_openat2+0x176/0x1e0 fs/open.c:1440 do_sys_open fs/open.c:1455 [inline] __do_sys_openat fs/open.c:1471 [inline] __se_sys_openat fs/open.c:1466 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1466 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b -> #1 (sb_internal){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1635 [inline] sb_start_intwrite include/linux/fs.h:1757 [inline] ext4_evict_inode+0xe55/0x1a30 fs/ext4/inode.c:212 evict+0x2ed/0x6b0 fs/inode.c:664 iput_final fs/inode.c:1775 [inline] iput.part.0+0x55e/0x7a0 fs/inode.c:1801 iput+0x5c/0x80 fs/inode.c:1791 dentry_unlink_inode+0x292/0x430 fs/dcache.c:401 __dentry_kill+0x3b8/0x640 fs/dcache.c:607 shrink_dentry_list+0x22b/0x7d0 fs/dcache.c:1201 prune_dcache_sb+0xeb/0x150 fs/dcache.c:1282 super_cache_scan+0x327/0x540 fs/super.c:228 do_shrink_slab+0x428/0x1120 mm/shrinker.c:435 shrink_slab_memcg mm/shrinker.c:548 [inline] shrink_slab+0xa83/0x1310 mm/shrinker.c:626 shrink_one+0x4f7/0x700 mm/vmscan.c:4724 shrink_many mm/vmscan.c:4776 [inline] lru_gen_shrink_node mm/vmscan.c:4893 [inline] shrink_node+0x20cd/0x3790 mm/vmscan.c:5833 kswapd_shrink_node mm/vmscan.c:6638 [inline] balance_pgdat+0xa32/0x1b80 mm/vmscan.c:6828 kswapd+0x5be/0xbf0 mm/vmscan.c:7088 kthread+0x33c/0x440 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 -> #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:3868 [inline] __lock_acquire+0x2e3d/0x5de0 kernel/locking/lockdep.c:5136 lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5718 __fs_reclaim_acquire mm/page_alloc.c:3693 [inline] fs_reclaim_acquire+0x100/0x150 mm/page_alloc.c:3707 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slab.h:710 [inline] slab_alloc_node mm/slub.c:3460 [inline] __kmem_cache_alloc_node+0x51/0x310 mm/slub.c:3517 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc_node+0x52/0x110 mm/slab_common.c:1014 kmalloc_node include/linux/slab.h:620 [inline] kvmalloc_node+0x6f/0x1a0 mm/util.c:607 kvmalloc include/linux/slab.h:738 [inline] ext4_xattr_inode_cache_find fs/ext4/xattr.c:1535 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1577 [inline] ext4_xattr_set_entry+0x1c3d/0x3ce0 fs/ext4/xattr.c:1719 ext4_xattr_block_set+0x678/0x3180 fs/ext4/xattr.c:1970 ext4_xattr_set_handle+0xd6e/0x1420 fs/ext4/xattr.c:2456 ext4_xattr_set+0x149/0x370 fs/ext4/xattr.c:2558 __vfs_setxattr+0x173/0x1d0 fs/xattr.c:201 __vfs_setxattr_noperm+0x127/0x5e0 fs/xattr.c:235 __vfs_setxattr_locked+0x17e/0x250 fs/xattr.c:296 vfs_setxattr+0x146/0x350 fs/xattr.c:322 do_setxattr+0x142/0x170 fs/xattr.c:630 setxattr+0x159/0x170 fs/xattr.c:653 __do_sys_fsetxattr fs/xattr.c:709 [inline] __se_sys_fsetxattr fs/xattr.c:698 [inline] __ia32_sys_fsetxattr+0x25e/0x310 fs/xattr.c:698 do_syscall_32_irqs_on arch/x86/entry/common.c:164 [inline] __do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:230 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:255 entry_SYSENTER_compat_after_hwframe+0x70/0x7a other info that might help us debug this: Chain exists of: fs_reclaim --> jbd2_handle --> &ei->xattr_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->xattr_sem); lock(jbd2_handle); lock(&ei->xattr_sem); lock(fs_reclaim); *** DEADLOCK *** 3 locks held by syz-executor.1/13825: #0: ffff888022928418 (sb_writers#4){.+.+}-{0:0}, at: __do_sys_fsetxattr fs/xattr.c:707 [inline] #0: ffff888022928418 (sb_writers#4){.+.+}-{0:0}, at: __se_sys_fsetxattr fs/xattr.c:698 [inline] #0: ffff888022928418 (sb_writers#4){.+.+}-{0:0}, at: __ia32_sys_fsetxattr+0x17a/0x310 fs/xattr.c:698 #1: ffff888079acde00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline] #1: ffff888079acde00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: vfs_setxattr+0x123/0x350 fs/xattr.c:321 #2: ffff888079acdac8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] #2: ffff888079acdac8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_set_handle+0x159/0x1420 fs/ext4/xattr.c:2371 stack backtrace: CPU: 0 PID: 13825 Comm: syz-executor.1 Not tainted 6.6.0-syzkaller-16201-gb57b17e88bf5 #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+0xd9/0x1b0 lib/dump_stack.c:106 check_noncircular+0x311/0x3f0 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:3868 [inline] __lock_acquire+0x2e3d/0x5de0 kernel/locking/lockdep.c:5136 lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5718 __fs_reclaim_acquire mm/page_alloc.c:3693 [inline] fs_reclaim_acquire+0x100/0x150 mm/page_alloc.c:3707 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slab.h:710 [inline] slab_alloc_node mm/slub.c:3460 [inline] __kmem_cache_alloc_node+0x51/0x310 mm/slub.c:3517 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc_node+0x52/0x110 mm/slab_common.c:1014 kmalloc_node include/linux/slab.h:620 [inline] kvmalloc_node+0x6f/0x1a0 mm/util.c:607 kvmalloc include/linux/slab.h:738 [inline] ext4_xattr_inode_cache_find fs/ext4/xattr.c:1535 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1577 [inline] ext4_xattr_set_entry+0x1c3d/0x3ce0 fs/ext4/xattr.c:1719 ext4_xattr_block_set+0x678/0x3180 fs/ext4/xattr.c:1970 ext4_xattr_set_handle+0xd6e/0x1420 fs/ext4/xattr.c:2456 ext4_xattr_set+0x149/0x370 fs/ext4/xattr.c:2558 __vfs_setxattr+0x173/0x1d0 fs/xattr.c:201 __vfs_setxattr_noperm+0x127/0x5e0 fs/xattr.c:235 __vfs_setxattr_locked+0x17e/0x250 fs/xattr.c:296 vfs_setxattr+0x146/0x350 fs/xattr.c:322 do_setxattr+0x142/0x170 fs/xattr.c:630 setxattr+0x159/0x170 fs/xattr.c:653 __do_sys_fsetxattr fs/xattr.c:709 [inline] __se_sys_fsetxattr fs/xattr.c:698 [inline] __ia32_sys_fsetxattr+0x25e/0x310 fs/xattr.c:698 do_syscall_32_irqs_on arch/x86/entry/common.c:164 [inline] __do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:230 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:255 entry_SYSENTER_compat_after_hwframe+0x70/0x7a RIP: 0023:0xf7f9a579 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:00000000f7f955ac EFLAGS: 00000292 ORIG_RAX: 00000000000000e4 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000020000000 RDX: 0000000020000080 RSI: 0000000000001008 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 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