==================================================================
BUG: KASAN: null-ptr-deref in instrument_atomic_write include/linux/instrumented.h:87 [inline]
BUG: KASAN: null-ptr-deref in set_bit include/asm-generic/bitops/instrumented-atomic.h:28 [inline]
BUG: KASAN: null-ptr-deref in do_page_cache_ra+0x18f/0x230 mm/readahead.c:324
Write of size 8 at addr 0000000000000000 by task udevd/317
CPU: 0 PID: 317 Comm: udevd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Call Trace:
__dump_stack+0x21/0x24 lib/dump_stack.c:88
dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
print_report+0x3d/0x60 mm/kasan/report.c:423
kasan_report+0x122/0x150 mm/kasan/report.c:524
check_region_inline mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189
__kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37
instrument_atomic_write include/linux/instrumented.h:87 [inline]
set_bit include/asm-generic/bitops/instrumented-atomic.h:28 [inline]
do_page_cache_ra+0x18f/0x230 mm/readahead.c:324
force_page_cache_ra mm/readahead.c:360 [inline]
page_cache_sync_ra+0x32b/0x3d0 mm/readahead.c:751
page_cache_sync_readahead include/linux/pagemap.h:1259 [inline]
filemap_get_pages mm/filemap.c:2706 [inline]
filemap_read+0x6b6/0x23c0 mm/filemap.c:2801
blkdev_read_iter+0x439/0x580 block/fops.c:668
call_read_iter include/linux/fs.h:2276 [inline]
new_sync_read fs/read_write.c:389 [inline]
vfs_read+0x46e/0x930 fs/read_write.c:470
ksys_read+0x14a/0x260 fs/read_write.c:613
__do_sys_read fs/read_write.c:623 [inline]
__se_sys_read fs/read_write.c:621 [inline]
__x64_sys_read+0x7b/0x90 fs/read_write.c:621
x64_sys_call+0x2f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:1
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd7d24a7407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffd5c50db70 EFLAGS: 00000202 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007fd7d2c27880 RCX: 00007fd7d24a7407
RDX: 0000000000000200 RSI: 00007fd7d2c1f000 RDI: 0000000000000009
RBP: 000055fc23326790 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000020000 R14: 000055fc23337578 R15: 00007fd7d2d4e39c
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000003
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 0 P4D 0
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 317 Comm: udevd Tainted: G B syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:arch_set_bit include/linux/instrumented.h:87 [inline]
RIP: 0010:set_bit include/asm-generic/bitops/instrumented-atomic.h:29 [inline]
RIP: 0010:do_page_cache_ra+0x18f/0x230 mm/readahead.c:324
Code: fd ff 48 3d 01 f0 ff ff 72 10 e8 7c 1e d2 ff 49 83 ee 01 73 78 e9 87 00 00 00 49 89 c4 48 89 c7 be 08 00 00 00 e8 11 ba 17 00 41 80 4c 24 03 10 4c 89 e7 48 83 c7 34 be 04 00 00 00 e8 f9 b9
RSP: 0018:ffffc90000e67878 EFLAGS: 00010246
RAX: ffff888122330000 RBX: 0000000000000020 RCX: ffff888122330000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000e678c8 R08: ffffffff87b777e7 R09: 1ffffffff0f6eefc
R10: dffffc0000000000 R11: fffffbfff0f6eefd R12: 0000000000000000
R13: 000000000000001f R14: 0000000000000000 R15: ffff88810b6ea3d0
FS: 00007fd7d2c27880(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000003 CR3: 000000010fdaa000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
force_page_cache_ra mm/readahead.c:360 [inline]
page_cache_sync_ra+0x32b/0x3d0 mm/readahead.c:751
page_cache_sync_readahead include/linux/pagemap.h:1259 [inline]
filemap_get_pages mm/filemap.c:2706 [inline]
filemap_read+0x6b6/0x23c0 mm/filemap.c:2801
blkdev_read_iter+0x439/0x580 block/fops.c:668
call_read_iter include/linux/fs.h:2276 [inline]
new_sync_read fs/read_write.c:389 [inline]
vfs_read+0x46e/0x930 fs/read_write.c:470
ksys_read+0x14a/0x260 fs/read_write.c:613
__do_sys_read fs/read_write.c:623 [inline]
__se_sys_read fs/read_write.c:621 [inline]
__x64_sys_read+0x7b/0x90 fs/read_write.c:621
x64_sys_call+0x2f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:1
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd7d24a7407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffd5c50db70 EFLAGS: 00000202 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007fd7d2c27880 RCX: 00007fd7d24a7407
RDX: 0000000000000200 RSI: 00007fd7d2c1f000 RDI: 0000000000000009
RBP: 000055fc23326790 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000020000 R14: 000055fc23337578 R15: 00007fd7d2d4e39c
Modules linked in:
CR2: 0000000000000003
---[ end trace 0000000000000000 ]---
RIP: 0010:arch_set_bit include/linux/instrumented.h:87 [inline]
RIP: 0010:set_bit include/asm-generic/bitops/instrumented-atomic.h:29 [inline]
RIP: 0010:do_page_cache_ra+0x18f/0x230 mm/readahead.c:324
Code: fd ff 48 3d 01 f0 ff ff 72 10 e8 7c 1e d2 ff 49 83 ee 01 73 78 e9 87 00 00 00 49 89 c4 48 89 c7 be 08 00 00 00 e8 11 ba 17 00 41 80 4c 24 03 10 4c 89 e7 48 83 c7 34 be 04 00 00 00 e8 f9 b9
RSP: 0018:ffffc90000e67878 EFLAGS: 00010246
RAX: ffff888122330000 RBX: 0000000000000020 RCX: ffff888122330000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000e678c8 R08: ffffffff87b777e7 R09: 1ffffffff0f6eefc
R10: dffffc0000000000 R11: fffffbfff0f6eefd R12: 0000000000000000
R13: 000000000000001f R14: 0000000000000000 R15: ffff88810b6ea3d0
FS: 00007fd7d2c27880(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000003 CR3: 000000010fdaa000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax
6: 72 10 jb 0x18
8: e8 7c 1e d2 ff call 0xffd21e89
d: 49 83 ee 01 sub $0x1,%r14
11: 73 78 jae 0x8b
13: e9 87 00 00 00 jmp 0x9f
18: 49 89 c4 mov %rax,%r12
1b: 48 89 c7 mov %rax,%rdi
1e: be 08 00 00 00 mov $0x8,%esi
23: e8 11 ba 17 00 call 0x17ba39
* 28: f0 41 80 4c 24 03 10 lock orb $0x10,0x3(%r12) <-- trapping instruction
2f: 4c 89 e7 mov %r12,%rdi
32: 48 83 c7 34 add $0x34,%rdi
36: be 04 00 00 00 mov $0x4,%esi
3b: e8 .byte 0xe8
3c: f9 stc
3d: b9 .byte 0xb9