==================================================================
BUG: KFENCE: use-after-free write in rose_timer_expiry+0x22d/0x4b0 net/rose/rose_timer.c:183
Use-after-free write at 0xffff88823bfe802a (in kfence-#243):
rose_timer_expiry+0x22d/0x4b0 net/rose/rose_timer.c:183
call_timer_fn+0x17b/0x5f0 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers kernel/time/timer.c:2372 [inline]
__run_timer_base+0x61a/0x860 kernel/time/timer.c:2384
run_timer_base kernel/time/timer.c:2393 [inline]
run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
handle_softirqs+0x283/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
flush_smp_call_function_queue+0x1ed/0x250 kernel/smp.c:620
do_idle+0x4a8/0x510 kernel/sched/idle.c:352
cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:423
rest_init+0x2de/0x300 init/main.c:745
start_kernel+0x47d/0x500 init/main.c:1102
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:307
x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:288
common_startup_64+0x13e/0x147
kfence-#243: 0xffff88823bfe8000-0xffff88823bfe80ef, size=240, cache=skbuff_head_cache
allocated by task 7088 on cpu 1 at 563.409394s (9.971555s ago):
__alloc_skb+0x112/0x2d0 net/core/skbuff.c:660
alloc_skb include/linux/skbuff.h:1336 [inline]
nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:748 [inline]
nsim_dev_trap_report drivers/net/netdevsim/dev.c:805 [inline]
nsim_dev_trap_report_work+0x29a/0xb80 drivers/net/netdevsim/dev.c:851
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
freed by task 7088 on cpu 1 at 563.409458s (10.015378s ago):
nsim_dev_trap_report drivers/net/netdevsim/dev.c:821 [inline]
nsim_dev_trap_report_work+0x7cf/0xb80 drivers/net/netdevsim/dev.c:851
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.16.0-rc6-syzkaller-00281-gf4a40a4282f4 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:rose_timer_expiry+0x22d/0x4b0 net/rose/rose_timer.c:183
Code: 80 3c 28 00 74 08 4c 89 e7 e8 5f 34 c4 f7 4d 8b 24 24 49 83 c4 2a 4c 89 e0 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 2c 02 00 00 <66> 41 ff 0c 24 4c 89 ff be 6e 00 00 00 ba ff ff ff ff b9 ff ff ff
RSP: 0018:ffffc90000007b68 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88806af336f8 RCX: ffffffff8de95280
RDX: 0000000000000100 RSI: ffffffff8f6670f0 RDI: 0000000000000002
RBP: 1ffff1100d5e66bd R08: ffffffff8de95280 R09: 0000000000000004
R10: 0000000000000004 R11: 0000000000000100 R12: ffff88823bfe802a
R13: dffffc0000000000 R14: ffff88806af331c0 R15: ffff88806af33000
FS: 0000000000000000(0000) GS:ffff888125c57000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff88823bfe802a CR3: 000000008cc0e000 CR4: 00000000003526f0
Call Trace:
call_timer_fn+0x17b/0x5f0 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers kernel/time/timer.c:2372 [inline]
__run_timer_base+0x61a/0x860 kernel/time/timer.c:2384
run_timer_base kernel/time/timer.c:2393 [inline]
run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
handle_softirqs+0x283/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:flush_smp_call_function_queue+0x1ed/0x250 kernel/smp.c:620
Code: 00 4d 85 f6 75 16 e8 d2 89 0b 00 eb 15 e8 cb 89 0b 00 e8 66 dc b1 09 4d 85 f6 74 ea e8 bc 89 0b 00 fb 48 c7 04 24 0e 36 e0 45 <4b> c7 04 3c 00 00 00 00 66 43 c7 44 3c 09 00 00 43 c6 44 3c 0b 00
RSP: 0018:ffffffff8de07ce0 EFLAGS: 00000293
RAX: ffffffff81b49cc4 RBX: 0000000000000000 RCX: ffffffff8de95280
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffffff8de07d90 R08: ffffffff8fa0b2f7 R09: 1ffffffff1f4165e
R10: dffffc0000000000 R11: fffffbfff1f4165f R12: 1ffffffff1bc0f9c
R13: 0000000000000000 R14: 0000000000000200 R15: dffffc0000000000
do_idle+0x4a8/0x510 kernel/sched/idle.c:352
cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:423
rest_init+0x2de/0x300 init/main.c:745
start_kernel+0x47d/0x500 init/main.c:1102
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:307
x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:288
common_startup_64+0x13e/0x147
==================================================================
----------------
Code disassembly (best guess):
0: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1)
4: 74 08 je 0xe
6: 4c 89 e7 mov %r12,%rdi
9: e8 5f 34 c4 f7 call 0xf7c4346d
e: 4d 8b 24 24 mov (%r12),%r12
12: 49 83 c4 2a add $0x2a,%r12
16: 4c 89 e0 mov %r12,%rax
19: 48 c1 e8 03 shr $0x3,%rax
1d: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax
22: 84 c0 test %al,%al
24: 0f 85 2c 02 00 00 jne 0x256
* 2a: 66 41 ff 0c 24 decw (%r12) <-- trapping instruction
2f: 4c 89 ff mov %r15,%rdi
32: be 6e 00 00 00 mov $0x6e,%esi
37: ba ff ff ff ff mov $0xffffffff,%edx
3c: b9 .byte 0xb9
3d: ff (bad)
3e: ff (bad)
3f: ff .byte 0xff