================================================================================ UBSAN: shift-out-of-bounds in net/core/gen_estimator.c:83:38 shift exponent -55 is negative CPU: 1 PID: 28999 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:check_kcov_mode+0x9/0x40 kernel/kcov.c:163 Code: ff 48 89 df e8 c8 33 43 00 e9 a1 fe ff ff 48 8b 3c 24 e8 ba 33 43 00 e9 18 fe ff ff cc cc cc cc cc 65 8b 05 19 af 8e 7e 89 c2 <81> e2 00 01 00 00 a9 00 01 ff 00 74 10 31 c0 85 d2 74 15 8b 96 cc RSP: 0018:ffffc9000987fa70 EFLAGS: 00000246 RAX: 0000000080000000 RBX: ffff888144125e00 RCX: ffff8880a45d8000 RDX: 0000000080000000 RSI: ffff8880a45d8000 RDI: 0000000000000003 RBP: ffffc9000987fbf0 R08: 0000000000000000 R09: 0000000000000005 R10: ffffffff8388c4da R11: 000000000000001f R12: ffff888144125e00 R13: 0000000000000005 R14: 0000000000000000 R15: 0000000000000000 write_comp_data kernel/kcov.c:218 [inline] __sanitizer_cov_trace_const_cmp1+0x22/0x80 kernel/kcov.c:270 tomoyo_check_path_acl+0x4a/0x210 security/tomoyo/file.c:258 tomoyo_check_acl+0x13c/0x450 security/tomoyo/domain.c:175 tomoyo_path_permission security/tomoyo/file.c:586 [inline] tomoyo_path_permission+0x1ff/0x3a0 security/tomoyo/file.c:573 tomoyo_path_perm+0x2ec/0x3f0 security/tomoyo/file.c:838 security_inode_getattr+0xcf/0x140 security/security.c:1280 vfs_getattr fs/stat.c:121 [inline] vfs_fstat+0x43/0xb0 fs/stat.c:146 __do_sys_newfstat+0x81/0x100 fs/stat.c:386 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f69c14f42e2 Code: 48 8b 05 b9 db 2b 00 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 83 ff 01 77 33 48 63 fe b8 05 00 00 00 48 89 d6 0f 05 <48> 3d 00 f0 ff ff 77 06 f3 c3 0f 1f 40 00 48 8b 15 81 db 2b 00 f7 RSP: 002b:00007fff0ec22dd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000005 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f69c14f42e2 RDX: 00007fff0ec22df0 RSI: 00007fff0ec22df0 RDI: 000000000000000f RBP: 00007fff0ec22f90 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000080000 R11: 0000000000000246 R12: 000055ea879e3090 R13: 000055ea879e2a40 R14: 000055ea879e1220 R15: 00007fff0ec22f50 ================================================================================