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Fri, 17 Apr 2026 12:03:04 -0700 (PDT) Date: Fri, 17 Apr 2026 12:03:04 -0700 In-Reply-To: <177644280177.3785830.6199963330622576626@talencesecurity.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69e283e8.a00a0220.1bd0ca.001b.GAE@google.com> Subject: Re: [syzbot] [jfs?] KMSAN: uninit-value in BT_STACK_DUMP From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tristmd@gmail.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KMSAN: uninit-value in irqentry_exit_to_kernel_mode_preempt ===================================================== BUG: KMSAN: uninit-value in irqentry_exit_to_kernel_mode_preempt+0xb0/0xc0 include/linux/irq-entry-common.h:472 irqentry_exit_to_kernel_mode_preempt+0xb0/0xc0 include/linux/irq-entry-common.h:472 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:547 [inline] irqentry_exit+0x7b/0x760 kernel/entry/common.c:164 sysvec_apic_timer_interrupt+0x52/0x90 arch/x86/kernel/apic/apic.c:1061 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:697 smap_restore arch/x86/include/asm/smap.h:90 [inline] get_shadow_origin_ptr mm/kmsan/instrumentation.c:39 [inline] __msan_metadata_ptr_for_load_4+0x2c/0x40 mm/kmsan/instrumentation.c:93 do_csum lib/checksum.c:64 [inline] ip_fast_csum+0x1e6/0x3f0 lib/checksum.c:99 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:842 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:876 [inline] nsim_dev_trap_report_work+0x8c0/0x1440 drivers/net/netdevsim/dev.c:922 process_one_work kernel/workqueue.c:3302 [inline] process_scheduled_works+0xb6c/0x1e60 kernel/workqueue.c:3385 worker_thread+0xee4/0x15a0 kernel/workqueue.c:3466 kthread+0x53f/0x600 kernel/kthread.c:436 ret_from_fork+0x20f/0x8d0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Uninit was created at: slab_post_alloc_hook mm/slub.c:4576 [inline] slab_alloc_node mm/slub.c:4898 [inline] __do_kmalloc_node mm/slub.c:5294 [inline] __kmalloc_node_track_caller_noprof+0x4f6/0x1740 mm/slub.c:5403 kmalloc_reserve net/core/skbuff.c:635 [inline] __alloc_skb+0x90d/0x1190 net/core/skbuff.c:713 alloc_skb include/linux/skbuff.h:1383 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:819 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:876 [inline] nsim_dev_trap_report_work+0x3f2/0x1440 drivers/net/netdevsim/dev.c:922 process_one_work kernel/workqueue.c:3302 [inline] process_scheduled_works+0xb6c/0x1e60 kernel/workqueue.c:3385 worker_thread+0xee4/0x15a0 kernel/workqueue.c:3466 kthread+0x53f/0x600 kernel/kthread.c:436 ret_from_fork+0x20f/0x8d0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 CPU: 0 UID: 0 PID: 34 Comm: kworker/u8:2 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Workqueue: events_unbound nsim_dev_trap_report_work ===================================================== Tested on: commit: d662a710 Merge tag 'dmaengine-7.1-rc1' of git://git.ke.. git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master console output: https://syzkaller.appspot.com/x/log.txt?x=127aa4ce580000 kernel config: https://syzkaller.appspot.com/x/.config?x=3dd68bb0183fc39c dashboard link: https://syzkaller.appspot.com/bug?extid=ba5f49027aace342d24d compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 patch: https://syzkaller.appspot.com/x/patch.diff?x=17ea1906580000