Messages in this thread | | | Date | Fri, 11 Oct 2019 08:42:01 -0700 | Subject | Re: KMSAN: uninit-value in alauda_check_media | From | syzbot <> |
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Hello,
syzbot has tested the proposed patch but the reproducer still triggered crash: KMSAN: uninit-value in alauda_check_media
===================================================== BUG: KMSAN: uninit-value in alauda_transport+0x462/0x57f0 drivers/usb/storage/alauda.c:1138 CPU: 1 PID: 11015 Comm: usb-storage Not tainted 5.4.0-rc2+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x191/0x1f0 lib/dump_stack.c:113 kmsan_report+0x14c/0x2c0 mm/kmsan/kmsan_report.c:110 __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:245 alauda_check_media+0x344/0x3310 drivers/usb/storage/alauda.c:461 alauda_transport+0x462/0x57f0 drivers/usb/storage/alauda.c:1138 usb_stor_invoke_transport+0xf5/0x27e0 drivers/usb/storage/transport.c:606 usb_stor_transparent_scsi_command+0x5d/0x70 drivers/usb/storage/protocol.c:108 usb_stor_control_thread+0xca6/0x11a0 drivers/usb/storage/usb.c:380 kthread+0x4b5/0x4f0 kernel/kthread.c:256 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355
Local variable description: ----status@alauda_check_media Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 11015 Comm: usb-storage Tainted: G B 5.4.0-rc2+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x191/0x1f0 lib/dump_stack.c:113 panic+0x3c9/0xc1e kernel/panic.c:220 kmsan_report+0x2b4/0x2c0 mm/kmsan/kmsan_report.c:133 __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:245 alauda_check_media+0x344/0x3310 drivers/usb/storage/alauda.c:461 alauda_transport+0x462/0x57f0 drivers/usb/storage/alauda.c:1138 usb_stor_invoke_transport+0xf5/0x27e0 drivers/usb/storage/transport.c:606 usb_stor_transparent_scsi_command+0x5d/0x70 drivers/usb/storage/protocol.c:108 usb_stor_control_thread+0xca6/0x11a0 drivers/usb/storage/usb.c:380 kthread+0x4b5/0x4f0 kernel/kthread.c:256 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355 Kernel Offset: disabled Rebooting in 86400 seconds..
Tested on:
commit: c40e5c97 kmsan: drop some dead code in kmsan_shadow.c git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=153ba453600000 kernel config: https://syzkaller.appspot.com/x/.config?x=49548798e87d32d7 dashboard link: https://syzkaller.appspot.com/bug?extid=e7d46eb426883fb97efd compiler: clang version 9.0.0 (/home/glider/llvm/clang 80fee25776c2fb61e74c1ecb1a523375c2500b69)
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