================================================================================ UBSAN: shift-out-of-bounds in net/core/gen_estimator.c:83:38 shift exponent -1 is negative CPU: 0 PID: 4904 Comm: systemd-udevd Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 ubsan_epilogue+0xb/0x5a lib/ubsan.c:148 __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 lib/ubsan.c:395 est_timer.cold+0xbb/0x12d net/core/gen_estimator.c:83 call_timer_fn+0x1a5/0x710 kernel/time/timer.c:1417 expire_timers kernel/time/timer.c:1462 [inline] __run_timers.part.0+0x692/0xa80 kernel/time/timer.c:1731 __run_timers kernel/time/timer.c:1712 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1744 __do_softirq+0x2bc/0xa77 kernel/softirq.c:343 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:226 [inline] __irq_exit_rcu+0x17f/0x200 kernel/softirq.c:420 irq_exit_rcu+0x5/0x20 kernel/softirq.c:432 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:orc_ip arch/x86/kernel/unwind_orc.c:30 [inline] RIP: 0010:__orc_find+0x7c/0xf0 arch/x86/kernel/unwind_orc.c:52 Code: e8 3f 48 c1 fa 02 48 01 d0 48 d1 f8 48 8d 5c 85 00 48 89 d8 48 c1 e8 03 42 0f b6 14 38 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 04 <84> d2 75 48 48 63 03 48 01 d8 48 39 c1 73 b0 4c 8d 63 fc 49 39 ec RSP: 0018:ffffc9000161f418 EFLAGS: 00000206 RAX: 0000000000000003 RBX: ffffffff8d913590 RCX: ffffffff81b51b51 RDX: 0000000000000000 RSI: ffffffff8e006480 RDI: ffffffff8d91358c RBP: ffffffff8d913590 R08: 0000000000029e03 R09: ffffffff8e006522 R10: fffff520002c3eb4 R11: 0000000000029de8 R12: ffffffff8d913590 R13: ffffffff8d91358c R14: ffffffff8d91358c R15: dffffc0000000000 orc_find arch/x86/kernel/unwind_orc.c:173 [inline] unwind_next_frame+0x347/0x2460 arch/x86/kernel/unwind_orc.c:443 arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:352 __kasan_slab_free+0x102/0x140 mm/kasan/common.c:422 slab_free_hook mm/slub.c:1544 [inline] slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1577 slab_free mm/slub.c:3140 [inline] kmem_cache_free+0x82/0x360 mm/slub.c:3156 kfree_skbmem+0xef/0x1b0 net/core/skbuff.c:627 __kfree_skb net/core/skbuff.c:684 [inline] consume_skb net/core/skbuff.c:839 [inline] consume_skb+0xcf/0x160 net/core/skbuff.c:833 skb_free_datagram+0x16/0xf0 net/core/datagram.c:325 unix_dgram_recvmsg+0x6ee/0xb60 net/unix/af_unix.c:2179 sock_recvmsg_nosec net/socket.c:886 [inline] sock_recvmsg net/socket.c:904 [inline] sock_recvmsg net/socket.c:900 [inline] ____sys_recvmsg+0x2c4/0x600 net/socket.c:2568 ___sys_recvmsg+0x127/0x200 net/socket.c:2610 __sys_recvmsg+0xe2/0x1a0 net/socket.c:2646 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f3c72614dc7 Code: 89 01 b8 ff ff ff ff eb d8 66 2e 0f 1f 84 00 00 00 00 00 8b 05 0a b6 20 00 85 c0 75 2e 48 63 ff 48 63 d2 b8 2f 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 b1 71 20 00 f7 d8 64 89 02 48 RSP: 002b:00007ffc7b8f3e68 EFLAGS: 00000246 ORIG_RAX: 000000000000002f RAX: ffffffffffffffda RBX: 00007ffc7b8f3eb0 RCX: 00007f3c72614dc7 RDX: 0000000000000040 RSI: 00007ffc7b8f3eb0 RDI: 0000000000000007 RBP: 00007ffc7b8f3eb0 R08: 0000000000000008 R09: 00005625151ee198 R10: 0000000000000004 R11: 0000000000000246 R12: 0000000200000001 R13: 00007ffc7b8f3ef0 R14: 00007ffc7b8f3ea0 R15: 00007ffc7b8f3e9f ================================================================================