================================================================================ UBSAN: shift-out-of-bounds in net/core/gen_estimator.c:83:38 shift exponent -247 is negative CPU: 1 PID: 19205 Comm: syz-executor.4 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+0x6f6/0xb10 kernel/time/timer.c:1731 run_timer_softirq+0x7d/0x140 kernel/time/timer.c:1744 __do_softirq+0x2cb/0xad5 kernel/softirq.c:298 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:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x18a/0x1b0 kernel/softirq.c:435 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:qlink_to_object mm/kasan/quarantine.c:139 [inline] RIP: 0010:qlink_free mm/kasan/quarantine.c:144 [inline] RIP: 0010:qlist_free_all+0x46/0xc0 mm/kasan/quarantine.c:170 Code: 49 be 00 00 00 00 00 ea ff ff 49 89 fd 49 bc 00 00 00 00 00 fc ff df eb 2d 48 63 87 c0 00 00 00 48 c7 c2 b5 b8 ba 81 4c 8b 3e <48> 29 c6 48 89 f0 48 c1 e8 03 42 c6 04 20 fb e8 16 c4 ff ff 4d 85 RSP: 0018:ffffc900039ef140 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffff88802e299a00 RCX: ffffea000096dc80 RDX: ffffffff81bab8b5 RSI: ffff888025b73c00 RDI: ffff888011041280 RBP: 0000000000000000 R08: 0000000000000007 R09: ffffffff81bab8b5 R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000 R13: ffffc900039ef178 R14: ffffea0000000000 R15: ffff888021768400 quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:267 __kasan_kmalloc.constprop.0+0x9e/0xd0 mm/kasan/common.c:442 slab_post_alloc_hook mm/slab.h:512 [inline] slab_alloc_node mm/slub.c:2889 [inline] kmem_cache_alloc_node+0x149/0x390 mm/slub.c:2925 __alloc_skb+0x71/0x5c0 net/core/skbuff.c:198 alloc_skb include/linux/skbuff.h:1099 [inline] alloc_skb_with_frags+0x93/0x5d0 net/core/skbuff.c:5849 sock_alloc_send_pskb+0x7a2/0x920 net/core/sock.c:2348 __ip_append_data+0x15bc/0x3240 net/ipv4/ip_output.c:1097 ip_make_skb+0x226/0x2a0 net/ipv4/ip_output.c:1634 udp_sendmsg+0x1c89/0x2830 net/ipv4/udp.c:1229 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:817 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xd3/0x130 net/socket.c:672 ____sys_sendmsg+0x331/0x810 net/socket.c:2336 ___sys_sendmsg+0xf3/0x170 net/socket.c:2390 __sys_sendmmsg+0x195/0x470 net/socket.c:2480 __do_sys_sendmmsg net/socket.c:2509 [inline] __se_sys_sendmmsg net/socket.c:2506 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2506 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ff629d20c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045e219 RDX: 04000000000001a8 RSI: 0000000020007fc0 RDI: 0000000000000003 RBP: 000000000119c070 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034 R13: 00007ffda8b2609f R14: 00007ff629d219c0 R15: 000000000119c034 ================================================================================