bisecting fixing commit since 0f091e43310f5c292b7094f9f115e651358e8053 building syzkaller on d5a3ae1f760e7cb2cd5a721d9645ae22eae114fe testing commit 0f091e43310f5c292b7094f9f115e651358e8053 with gcc (GCC) 8.4.1 20210217 kernel signature: a98e028563c794949bf01c456c8e9e0b870e794739718df27c2ed1c3472e683e run #0: crashed: BUG: soft lockup in mutex_spin_on_owner run #1: crashed: BUG: soft lockup in ipv6_rcv run #2: crashed: BUG: soft lockup in do_idle run #3: crashed: BUG: soft lockup in do_idle run #4: crashed: BUG: soft lockup in do_idle run #5: crashed: BUG: workqueue lockup run #6: crashed: BUG: soft lockup in do_idle run #7: crashed: BUG: soft lockup in do_idle run #8: crashed: BUG: workqueue lockup run #9: crashed: BUG: soft lockup in do_idle run #10: crashed: BUG: soft lockup in mld_ifc_timer_expire run #11: crashed: BUG: soft lockup in do_idle run #12: crashed: BUG: soft lockup in do_idle run #13: crashed: BUG: soft lockup in do_idle run #14: crashed: BUG: workqueue lockup run #15: crashed: BUG: soft lockup in mutex_spin_on_owner run #16: crashed: BUG: soft lockup in rtnl_newlink run #17: crashed: BUG: soft lockup in do_idle run #18: crashed: BUG: soft lockup in linkwatch_event run #19: crashed: BUG: soft lockup in do_idle testing current HEAD 9d31d2338950293ec19d9b095fbaa9030899dcb4 testing commit 9d31d2338950293ec19d9b095fbaa9030899dcb4 with gcc (GCC) 10.2.1 20210217 kernel signature: 135acf9de6a71338c13e1e2ea54b8fc531a69a6104d50acf2978c3df1f584c2f run #0: crashed: BUG: soft lockup in smp_call_function run #1: crashed: BUG: soft lockup in smp_call_function run #2: crashed: BUG: soft lockup in do_idle run #3: crashed: BUG: soft lockup in rtnl_newlink run #4: crashed: BUG: soft lockup in do_idle run #5: crashed: BUG: soft lockup in rtnl_newlink run #6: crashed: BUG: soft lockup in do_idle run #7: crashed: BUG: soft lockup in do_idle run #8: crashed: BUG: soft lockup in do_idle run #9: crashed: BUG: soft lockup in do_huge_pmd_anonymous_page revisions tested: 2, total time: 22m34.604200521s (build: 12m9.831512292s, test: 9m26.130805166s) the crash still happens on HEAD commit msg: Merge tag 'net-next-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next crash: BUG: soft lockup in do_huge_pmd_anonymous_page watchdog: BUG: soft lockup - CPU#1 stuck for 47s! [syz-executor.1:7428] Modules linked in: irq event stamp: 1492 hardirqs last enabled at (1491): [] asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:623 hardirqs last disabled at (1492): [] sysvec_apic_timer_interrupt+0xb/0xc0 arch/x86/kernel/apic/apic.c:1100 softirqs last enabled at (1490): [] invoke_softirq kernel/softirq.c:433 [inline] softirqs last enabled at (1490): [] __irq_exit_rcu kernel/softirq.c:637 [inline] softirqs last enabled at (1490): [] irq_exit_rcu+0x250/0x2a0 kernel/softirq.c:649 softirqs last disabled at (1475): [] invoke_softirq kernel/softirq.c:433 [inline] softirqs last disabled at (1475): [] __irq_exit_rcu kernel/softirq.c:637 [inline] softirqs last disabled at (1475): [] irq_exit_rcu+0x250/0x2a0 kernel/softirq.c:649 CPU: 1 PID: 7428 Comm: syz-executor.1 Not tainted 5.12.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:arch_local_irq_enable+0x2c/0x40 arch/x86/include/asm/paravirt.h:694 Code: c0 00 32 37 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 14 48 83 3d 3d f2 e3 07 00 74 08 fb 66 0f 1f 44 00 00 0f 0b 48 c7 c7 00 32 37 89 e8 d5 d5 51 00 eb de 0f 1f 00 48 b8 RSP: 0000:ffffc90004bb7c00 EFLAGS: 00000282 RAX: 1ffffffff126e640 RBX: 0000000000000001 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: ffffffff87cb3f80 RDI: ffffffff88131120 RBP: ffffffff894c73e0 R08: 0000000000000001 R09: ffffffff8bfe7bc7 R10: fffffbfff17fcf78 R11: 000000000006a086 R12: ffff88811712a400 R13: 0000000000000000 R14: 00000000ffffffff R15: ffff88811712ada0 FS: 0000000001bda400(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000600 CR3: 0000000101af9003 CR4: 00000000001706e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: arch_local_irq_restore arch/x86/include/asm/irqflags.h:140 [inline] lock_is_held_type+0xfa/0x130 kernel/locking/lockdep.c:5557 lock_is_held include/linux/lockdep.h:283 [inline] ___might_sleep+0x234/0x300 kernel/sched/core.c:8304 process_huge_page mm/memory.c:5051 [inline] clear_huge_page+0x151/0x440 mm/memory.c:5112 __do_huge_pmd_anonymous_page mm/huge_memory.c:607 [inline] do_huge_pmd_anonymous_page+0x4d0/0x1670 mm/huge_memory.c:772 create_huge_pmd mm/memory.c:4189 [inline] __handle_mm_fault+0x20ea/0x2e90 mm/memory.c:4424 handle_mm_fault+0x15a/0x610 mm/memory.c:4551 do_user_addr_fault+0x3f9/0xdd0 arch/x86/mm/fault.c:1390 handle_page_fault arch/x86/mm/fault.c:1475 [inline] exc_page_fault+0x6a/0xe0 arch/x86/mm/fault.c:1531 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:577 RIP: 0033:0x460878 Code: d1 f3 a4 c3 80 fa 10 73 17 80 fa 08 73 27 80 fa 04 73 33 80 fa 01 77 3b 72 05 0f b6 0e 88 0f c3 c5 fa 6f 06 c5 fa 6f 4c 16 f0 fa 7f 07 c5 fa 7f 4c 17 f0 c3 48 8b 4c 16 f8 48 8b 36 48 89 4c RSP: 002b:00007fff2801e338 EFLAGS: 00010246 RAX: 0000000020000600 RBX: 000000000055d900 RCX: 0000000000960000 RDX: 0000000000000010 RSI: 0000000000560080 RDI: 0000000020000600 RBP: 00007fff2801e3d8 R08: 0000001b2ff20018 R09: 0000001b2ff2001c R10: 00007fff2801e3f0 R11: 0000000000000246 R12: 00000000000003e8 R13: 000000000055cf0c R14: 000000000055cf00 R15: 000000000055cf00