[syzbot] WARNING: locking bug in ext4_xattr_set_handle

From: syzbot
Date: Fri Nov 04 2022 - 12:01:06 EST

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Hello,

syzbot found the following issue on:

HEAD commit: bbed346d5a96 Merge branch 'for-next/core' into for-kernelci
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=117d8612880000
kernel config: https://syzkaller.appspot.com/x/.config?x=3a4a45d2d827c1e
dashboard link: https://syzkaller.appspot.com/bug?extid=286461548e5d28662be0
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e8e91bc79312/disk-bbed346d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c1cb3fb3b77e/vmlinux-bbed346d.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+286461548e5d28662be0@xxxxxxxxxxxxxxxxxxxxxxxxx

WARNING: CPU: 1 PID: 1262 at kernel/locking/lockdep.c:231 check_wait_context kernel/locking/lockdep.c:4727 [inline]
WARNING: CPU: 1 PID: 1262 at kernel/locking/lockdep.c:231 __lock_acquire+0x2b0/0x30a4 kernel/locking/lockdep.c:5003
Modules linked in:
CPU: 1 PID: 1262 Comm: syz-executor.3 Not tainted 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022
pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : check_wait_context kernel/locking/lockdep.c:4727 [inline]
pc : __lock_acquire+0x2b0/0x30a4 kernel/locking/lockdep.c:5003
lr : hlock_class kernel/locking/lockdep.c:231 [inline]
lr : check_wait_context kernel/locking/lockdep.c:4727 [inline]
lr : __lock_acquire+0x298/0x30a4 kernel/locking/lockdep.c:5003
sp : ffff80001f27b6c0
x29: ffff80001f27b7a0 x28: 0000000000000002 x27: ffff000110424fd0
x26: ffff000110307fa8 x25: ffff000110425a00 x24: 0000000000000000
x23: 0000000000000000 x22: 0000000000000001 x21: 0000000000000000
x20: 0000000000000000 x19: 555554aaac035e9d x18: 00000000000000c0
x17: ffff80000dd0b198 x16: ffff80000db49158 x15: ffff000110424f80
x14: 0000000000000000 x13: 0000000000000012 x12: ffff80000d5ef920
x11: ff808000081c0d5c x10: ffff80000dd0b198 x9 : 681d91b9a9b43a00
x8 : 0000000000000000 x7 : 4e5241575f534b43 x6 : ffff80000819545c
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000000 x1 : 0000000100000000 x0 : 0000000000000016
Call trace:
check_wait_context kernel/locking/lockdep.c:4727 [inline]
__lock_acquire+0x2b0/0x30a4 kernel/locking/lockdep.c:5003
lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666
down_write+0x5c/0xcc kernel/locking/rwsem.c:1552
ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline]
ext4_xattr_set_handle+0xd0/0x994 fs/ext4/xattr.c:2309
ext4_xattr_set+0x100/0x1d0 fs/ext4/xattr.c:2495
ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38
__vfs_setxattr+0x250/0x260 fs/xattr.c:182
__vfs_setxattr_noperm+0xcc/0x320 fs/xattr.c:216
__vfs_setxattr_locked+0x16c/0x194 fs/xattr.c:277
vfs_setxattr+0x174/0x280 fs/xattr.c:313
do_setxattr fs/xattr.c:600 [inline]
setxattr fs/xattr.c:623 [inline]
path_setxattr+0x354/0x414 fs/xattr.c:642
__do_sys_setxattr fs/xattr.c:658 [inline]
__se_sys_setxattr fs/xattr.c:654 [inline]
__arm64_sys_setxattr+0x2c/0x40 fs/xattr.c:654
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206
el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581
irq event stamp: 1909
hardirqs last enabled at (1909): [<ffff80000bfb8138>] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline]
hardirqs last enabled at (1909): [<ffff80000bfb8138>] exit_to_kernel_mode+0xe8/0x118 arch/arm64/kernel/entry-common.c:94
hardirqs last disabled at (1908): [<ffff80000801c880>] local_daif_mask+0x14/0x20 arch/arm64/include/asm/daifflags.h:38
softirqs last enabled at (1892): [<ffff80000801c33c>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (1890): [<ffff80000801c308>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---
BUG: sleeping function called from invalid context at arch/arm64/mm/fault.c:593
in_atomic(): 0, irqs_disabled(): 128, non_block: 0, pid: 1262, name: syz-executor.3
preempt_count: 0, expected: 0
RCU nest depth: 0, expected: 0
INFO: lockdep is turned off.
irq event stamp: 1909
hardirqs last enabled at (1909): [<ffff80000bfb8138>] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline]
hardirqs last enabled at (1909): [<ffff80000bfb8138>] exit_to_kernel_mode+0xe8/0x118 arch/arm64/kernel/entry-common.c:94
hardirqs last disabled at (1908): [<ffff80000801c880>] local_daif_mask+0x14/0x20 arch/arm64/include/asm/daifflags.h:38
softirqs last enabled at (1892): [<ffff80000801c33c>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (1890): [<ffff80000801c308>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
CPU: 1 PID: 1262 Comm: syz-executor.3 Tainted: G W 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022
Call trace:
dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:156
show_stack+0x2c/0x54 arch/arm64/kernel/stacktrace.c:163
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x104/0x16c lib/dump_stack.c:106
dump_stack+0x1c/0x58 lib/dump_stack.c:113
__might_resched+0x208/0x218 kernel/sched/core.c:9892
__might_sleep+0x48/0x78 kernel/sched/core.c:9821
do_page_fault+0x214/0x79c arch/arm64/mm/fault.c:593
do_translation_fault+0x78/0x194 arch/arm64/mm/fault.c:685
do_mem_abort+0x54/0x130 arch/arm64/mm/fault.c:821
el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:366
el1h_64_sync_handler+0x60/0xac arch/arm64/kernel/entry-common.c:426
el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:576
hlock_class kernel/locking/lockdep.c:222 [inline]
check_wait_context kernel/locking/lockdep.c:4728 [inline]
__lock_acquire+0x2d0/0x30a4 kernel/locking/lockdep.c:5003
lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666
down_write+0x5c/0xcc kernel/locking/rwsem.c:1552
ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline]
ext4_xattr_set_handle+0xd0/0x994 fs/ext4/xattr.c:2309
ext4_xattr_set+0x100/0x1d0 fs/ext4/xattr.c:2495
ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38
__vfs_setxattr+0x250/0x260 fs/xattr.c:182
__vfs_setxattr_noperm+0xcc/0x320 fs/xattr.c:216
__vfs_setxattr_locked+0x16c/0x194 fs/xattr.c:277
vfs_setxattr+0x174/0x280 fs/xattr.c:313
do_setxattr fs/xattr.c:600 [inline]
setxattr fs/xattr.c:623 [inline]
path_setxattr+0x354/0x414 fs/xattr.c:642
__do_sys_setxattr fs/xattr.c:658 [inline]
__se_sys_setxattr fs/xattr.c:654 [inline]
__arm64_sys_setxattr+0x2c/0x40 fs/xattr.c:654
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206
el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581
Unable to handle kernel NULL pointer dereference at virtual address 00000000000000b8
Mem abort info:
ESR = 0x0000000096000006
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x06: level 2 translation fault
Data abort info:
ISV = 0, ISS = 0x00000006
CM = 0, WnR = 0
user pgtable: 4k pages, 48-bit VAs, pgdp=00000001591bd000
[00000000000000b8] pgd=0800000160ba5003, p4d=0800000160ba5003, pud=08000001551c0003, pmd=0000000000000000
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 1262 Comm: syz-executor.3 Tainted: G W 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022
pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : check_wait_context kernel/locking/lockdep.c:4727 [inline]
pc : __lock_acquire+0x2d0/0x30a4 kernel/locking/lockdep.c:5003
lr : hlock_class kernel/locking/lockdep.c:231 [inline]
lr : check_wait_context kernel/locking/lockdep.c:4727 [inline]
lr : __lock_acquire+0x298/0x30a4 kernel/locking/lockdep.c:5003
sp : ffff80001f27b6c0
x29: ffff80001f27b7a0 x28: 0000000000000002 x27: ffff000110424fd0
x26: ffff000110307fa8 x25: ffff000110425a00 x24: 0000000000000000
x23: 0000000000000000 x22: 0000000000000001 x21: 0000000000000000
x20: 0000000000000000 x19: 555554aaac035e9d x18: 00000000000000c0
x17: ffff80000dd0b198 x16: ffff80000db49158 x15: ffff000110424f80
x14: 0000000000000000 x13: 0000000000000012 x12: ffff80000d5ef920
x11: ff808000081c0d5c x10: ffff80000dd0b198 x9 : 0000000000041e9d
x8 : 0000000000000000 x7 : 4e5241575f534b43 x6 : ffff80000819545c
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000000 x1 : 0000000100000000 x0 : 0000000000000016
Call trace:
hlock_class kernel/locking/lockdep.c:222 [inline]
check_wait_context kernel/locking/lockdep.c:4728 [inline]
__lock_acquire+0x2d0/0x30a4 kernel/locking/lockdep.c:5003
lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666
down_write+0x5c/0xcc kernel/locking/rwsem.c:1552
ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline]
ext4_xattr_set_handle+0xd0/0x994 fs/ext4/xattr.c:2309
ext4_xattr_set+0x100/0x1d0 fs/ext4/xattr.c:2495
ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38
__vfs_setxattr+0x250/0x260 fs/xattr.c:182
__vfs_setxattr_noperm+0xcc/0x320 fs/xattr.c:216
__vfs_setxattr_locked+0x16c/0x194 fs/xattr.c:277
vfs_setxattr+0x174/0x280 fs/xattr.c:313
do_setxattr fs/xattr.c:600 [inline]
setxattr fs/xattr.c:623 [inline]
path_setxattr+0x354/0x414 fs/xattr.c:642
__do_sys_setxattr fs/xattr.c:658 [inline]
__se_sys_setxattr fs/xattr.c:654 [inline]
__arm64_sys_setxattr+0x2c/0x40 fs/xattr.c:654
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206
el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581
Code: b002db8a 91056210 9106614a b9400329 (3942e114)
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
0: b002db8a adrp x10, 0x5b71000
4: 91056210 add x16, x16, #0x158
8: 9106614a add x10, x10, #0x198
c: b9400329 ldr w9, [x25]
* 10: 3942e114 ldrb w20, [x8, #184] <-- trapping instruction

---
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