Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 UID: 0 PID: 7845 Comm: syz.6.206 Not tainted 6.14.0-rc7-syzkaller-00205-g586de92313fc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:dst_dev_put+0x27/0x290 net/core/dst.c:146
Code: 90 90 90 f3 0f 1e fa 55 41 57 41 56 41 55 41 54 53 49 89 fd 49 bf 00 00 00 00 00 fc ff df e8 70 73 fa f7 4d 89 ec 49 c1 ec 03 <43> 80 3c 3c 00 74 08 4c 89 ef e8 da 2b 5f f8 4d 8b 75 00 49 8d 7d
RSP: 0018:ffffc90000a28af8 EFLAGS: 00010247
RAX: ffffffff89c76c00 RBX: 0000000000000004 RCX: ffff88802f989e00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 1ffffffff1ca7e4a R08: ffffffff8a705d89 R09: 1ffff1100abce4c0
R10: dffffc0000000000 R11: ffffed100abce4c1 R12: 0000000000000000
R13: 0000000000000004 R14: 00000000fffffff8 R15: dffffc0000000000
FS: 00007f906300e6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9057bff000 CR3: 000000007ca10000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rt_fibinfo_free_cpus net/ipv4/fib_semantics.c:201 [inline]
fib_nh_common_release+0x1fc/0x420 net/ipv4/fib_semantics.c:212
fib_nh_release net/ipv4/fib_semantics.c:224 [inline]
free_fib_info_rcu+0xdc/0x4a0 net/ipv4/fib_semantics.c:236
rcu_do_batch kernel/rcu/tree.c:2546 [inline]
rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2802
handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561
__do_softirq kernel/softirq.c:595 [inline]
invoke_softirq kernel/softirq.c:435 [inline]
__irq_exit_rcu+0xf7/0x220 kernel/softirq.c:662
irq_exit_rcu+0x9/0x30 kernel/softirq.c:678
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202
Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 ba 02 99 f5 48 89 df e8 a2 4b 9a f5 e8 cd b5 c5 f5 fb bf 01 00 00 00 02 8c 8b f5 65 8b 05 d3 dd ff 73 85 c0 74 06 5b c3 cc cc cc cc
RSP: 0018:ffffc9000b487630 EFLAGS: 00000286
RAX: 100c8ce940a4b200 RBX: ffff88802a3d5890 RCX: ffffffff819d4b6a
RDX: dffffc0000000000 RSI: ffffffff8c2ab3a0 RDI: 0000000000000001
RBP: ffffc9000b487790 R08: ffffffff945178ff R09: 1ffffffff28a2f1f
R10: dffffc0000000000 R11: fffffbfff28a2f20 R12: 0000000000000000
R13: dffffc0000000000 R14: 1ffff92001690edf R15: 0000000000000cc0
spin_unlock_irq include/linux/spinlock.h:401 [inline]
shmem_add_to_page_cache+0x979/0xcc0 mm/shmem.c:903
shmem_alloc_and_add_folio+0x968/0x1090 mm/shmem.c:1928
shmem_get_folio_gfp+0x621/0x1840 mm/shmem.c:2545
shmem_get_folio mm/shmem.c:2651 [inline]
shmem_write_begin+0x165/0x350 mm/shmem.c:3301
generic_perform_write+0x327/0xa00 mm/filemap.c:4102
shmem_file_write_iter+0xf9/0x120 mm/shmem.c:3477
new_sync_write fs/read_write.c:586 [inline]
vfs_write+0xacf/0xd10 fs/read_write.c:679
ksys_write+0x18f/0x2b0 fs/read_write.c:731
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f906218bc1f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007f906300ddf0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000200000 RCX: 00007f906218bc1f
RDX: 0000000000200000 RSI: 00007f9057a00000 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000eb7
R10: 0000200000004542 R11: 0000000000000293 R12: 0000000000000004
R13: 00007f906300def0 R14: 00007f906300deb0 R15: 00007f9057a00000
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dst_dev_put+0x27/0x290 net/core/dst.c:146
Code: 90 90 90 f3 0f 1e fa 55 41 57 41 56 41 55 41 54 53 49 89 fd 49 bf 00 00 00 00 00 fc ff df e8 70 73 fa f7 4d 89 ec 49 c1 ec 03 <43> 80 3c 3c 00 74 08 4c 89 ef e8 da 2b 5f f8 4d 8b 75 00 49 8d 7d
RSP: 0018:ffffc90000a28af8 EFLAGS: 00010247
RAX: ffffffff89c76c00 RBX: 0000000000000004 RCX: ffff88802f989e00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 1ffffffff1ca7e4a R08: ffffffff8a705d89 R09: 1ffff1100abce4c0
R10: dffffc0000000000 R11: ffffed100abce4c1 R12: 0000000000000000
R13: 0000000000000004 R14: 00000000fffffff8 R15: dffffc0000000000
FS: 00007f906300e6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9057bff000 CR3: 000000007ca10000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: f3 0f 1e fa endbr64
7: 55 push %rbp
8: 41 57 push %r15
a: 41 56 push %r14
c: 41 55 push %r13
e: 41 54 push %r12
10: 53 push %rbx
11: 49 89 fd mov %rdi,%r13
14: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15
1b: fc ff df
1e: e8 70 73 fa f7 call 0xf7fa7393
23: 4d 89 ec mov %r13,%r12
26: 49 c1 ec 03 shr $0x3,%r12
* 2a: 43 80 3c 3c 00 cmpb $0x0,(%r12,%r15,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 4c 89 ef mov %r13,%rdi
34: e8 da 2b 5f f8 call 0xf85f2c13
39: 4d 8b 75 00 mov 0x0(%r13),%r14
3d: 49 rex.WB
3e: 8d .byte 0x8d
3f: 7d .byte 0x7d